Chapter 38. The Bruderkrieg / War of the League of Mühlhausen
1545-1548; Germany.
“Thus, we shall judge the emperor in this case, not to be the emperor, but a soldier and mercenary of the Pope.”
— Martin Luther
Musical Accompaniment: Vecchie Letrose
Map of the Holy Roman Empire, 1547.
The seeds for the War of the League of Mühlhausen, better known as the
Bruderkrieg in German, were laid in the aftermath of the Italian War of 1542-44 through the Treaty of Compiègne. Charles V, Holy Roman Emperor, had conceded to the Protestants on some matters to prosecute the war, but many were fearful of his true intentions in the aftermath. Soon after the end of the war, Charles entered negotiations with Pope Gelasius III to open a general church council in Bologna (which received tepid support from François), along with a secret promise to provide funding should war break out against the Protestants. In the east, Charles negotiated a truce with the Ottomans. The
Truce of Adrianople forced Charles and his son Maximilian to recognize Ottoman control over Hungary. In return, they were allowed to retain western and northern districts in Hungary that had rallied to Elisabeth of Bohemia—in exchange for a yearly payment of ƒ30,000. This breathing room also allowed Charles to reaffirm his ties to Catholic princes within the empire: the Duchy of Saxony, once held by the steadfastly Protestant
Heinrich the Pious, had been succeeded in 1541 by his sole surviving son, Severin—who had been reared as a Catholic at the imperial court. In 1545, Severin married
Anna Gennara of Savoy, the emperor’s niece. Martin Luther, a man in failing health, was the sole glue that held the Protestant camp together.
Luther, who had begun suffering from ill health in the 1530s, passed away in February 1546. He was interned in the
Schlosskirche in Wittenberg at the front of the pulpit. With his death, the last restraint upon the Protestant Princes was lifted: no longer would they need to listen to Luther’s moral and legal reasons to avoid war with the emperor, nor his entreaties that they should resist his demands. For the League of Mühlhausen, they saw a dangerous foe in the emperor, a man who had never kept his word to them. They had no interest in attending the new Papal council that would soon open. Rather than be caught unaware, members of the League agreed to meet at Saalfeld in July 1546 to decide how they would respond militarily to the emperor.
“The emperor has greater resources, that is true,” Philip of Hesse argued before the meeting of the princes.
“But we are of quicker wit… we can mobilize our forces quicker than the emperor can raise his. We must strike—deal a preventative blow before he can quash us beneath his feet.” At Saalfeld, the Protestants decided that the emperor must be struck down as quickly as possible. They relied upon Luther’s idea of a
Beerwolf—that the emperor had violated the political contract between himself and the princes, giving them the right to take military action. The spark that lit the fires of war began in Hesse when Protestant troops occupied the city of Gersfeld—a Catholic city attached to the territories of the Princely Abbey of Fulda.
“They wasted little time in pillaging the city,” one historian wrote of the early days of the conflict.
“They looted the homes of the residents, but their greatest travesty was Gerfeld’s church… the troops stripped it of its Catholic ornaments. Afterward, they hosted a bonfire, forcing the citizenry to watch as the so-called relics of idolatry were burnt.”
News of this atrocity soon reached the emperor, who had taken up residence once more in Brussels. He conferred with his counsellors, who at this epoch included Nicholas Perrenot, Arianitto Comène—known also as Arianitto Cominato—Viglius van Ayatta, and Louis of Praet. The imperial council urged a proactive response to the crisis, believing that this represented a chance for Charles to deal a militant blow against the Protestant Princes.
“His Majesty has decided to place an imperial ban upon the league,” Empress Renée wrote in a letter to her confidant, Michelle Saubonne.
“He intends to march against them… I am twisted in knots… a traitor to my faith if I am silent, a traitor to my husband if I speak. I must suffer in silence and hope for better days.” Renée and Charles’ relations had cooled down by the 1540s following the birth of their last child. There were tensions from their clashing personalities and Renée’s growing faith, which she kept a secret. In 1545, the Inquisitor General of the Low Countries, Ruard Tapper, questioned several of her servants. Several of Renée’s French servants were found to possess Protestant tracts and were proclaimed guilty of heresy. Tapper, a lenient man who believed that spiritual issues needed spiritual solutions, imposed penances upon those guilty. Clément Marot, Renée’s secretary, formally abjured his Protestant faith—but died shortly after, some believed from shock. The scandal forced Charles to intervene. He banished Anne’s French servants, who were ordered to return to France despite Renée’s fierce protestations. When Charles ordered Renée’s own chambers searched, it was discovered that she used a secret compartment within one of her chests to hide not only Protestant tracts but letters that she had received from Jean Calvin and Philip Melanchthon, which made clear her steadfast faith.
“We shall deal with this matter in due course,” Charles allegedly uttered coldly to Renée when her secret was discovered. Charles sternly ordered Renée to retire to Mechelen, where she was given the former residence of Margaret of York, the
Hof van York. Renée was also forbidden to take the children: Charles retained custody of their three daughters,
Anne, Adélaïde, and
Michèle, as well as their two sons,
Charles, and
Jean. This meant an effective end to their relationship and marriage; never again would Charles and Renée live under the same roof. For now, the emperor had a greater focus than his heretic wife—he commanded none to speak of it.
Severinus/Severin, Duke of Saxony; AI Generated.
Charles brought together an army of some 50,000 men—this included not only 25,000 Germans but some 15,000 troops from the Low Countries, and some 15,000 men loaned to him: comprised of 10,000 English troops under the personal command of King John. Prince Ferdinand promised some 5,000 men—remnants of the force that had invaded Naples, but their arrival was uncertain. Charles’ son also pledged to provide some 13,000 troops from Bohemia if needed. In July 1546, Charles formally placed both Philip of Hesse and Johann Friedrich of Saxony under an imperial ban, relating to their actions in Wölfenbuttel, where they had deposed the duke, Heinrich V. Charles was able to gather his army with relatively little trouble at Leuven. The emperor was aided in this by Duke Severin of Saxony, who used the support of Maximilian in Bohemia to initiate an invasion of the Electorate of Saxony in October 1546.
“I have given the duke all the aid that he desires,” Maximilian wrote in a letter to his father.
“The diet has not exactly been as liberal with funding as I have hoped—but we shall render all the aid he needs to succeed.” Johann Friedrich was soon forced to abandon his position in Hesse to return to Saxony, where he succeeded in liberating his territories. By the fall, Johann Friedrich launched a counterattack into the Albertine Saxon lands held by Duke Severin and the adjacent lands within the Kingdom of Bohemia. As the weather turned colder and snow coated the empire, campaigning stopped for the year. Charles wintered in Mainz with his nephew John.
“There is naught but ice and snow everywhere we look,” John wrote in a letter to Mary.
“We have been in Mainz for nearly a fortnight now, and a terrible storm rolled through overnight. The city is covered in snow, a frozen idol awaiting the warmth of spring. Continue to care for yourself and our children; I was most gladdened to hear in your last letter that little York and Somerset continue to thrive, and that Isabella has recovered from her fever.”
Campaigning resumed in early 1547. Charles was able to capture several Lutheran imperial cities, such as Frankfurt. Some princes that supported the League of Mühlhausen, such as Duke Ulrich of Württemberg and Friedrich II, the Count Palatine of the Rhine, chose to submit to the emperor rather than fight. Imperial forces moved quickly into the domains of Philip of Hesse, where the Hessian troops were dealt a brutal blow at the
Battle of Gießen.
“Gießen marked a drastic change in the ambitions of Philip of Hesse,” one 18th-century historian wrote in his treatise about the
Bruderskrieg.
“Imperial troops had rapidly overrun his domains, and the landgrave had no choice but to throw himself before the emperor. Emperor Charles V granted the rebel an interview near Laubach; he begged plainly for mercy: that his domains were to remain intact and that he should be freed. The emperor thought differently and ordered the landgrave to be closely confined. He was eventually transferred to the citadel near Namur, where he would await his fate…” The collapse of the Hessian forces dealt a significant blow to Johann Friedrich’s position and the League’s.
“Johann Friedrich hoped vainly that the Bohemian Protestants might rise up and aid his cause,” another historian wrote.
“He discovered quickly that the Bohemians, with their rights protected and affirmed under their new king, had no interest in joining a rebel movement that was fast losing steam.” By April 1547, imperial troops had reached Saxony—joined by men from the Duke of Severin’s army. Johann Friedrich’s troops came to rest Köttlitz—he had divided his army, with a significant amount dispatched to prevent Bohemian soldiers from joining the imperial army. He had also expended an incredible amount of manpower to garrison cities and towns in southern Saxony—leaving only a small number of troops to cover the Elbe River, which he considered too significant for the imperial army to cross.
Mercy after the Battle of Gießen, Engraving.
Charles first reached the Elbe River on the evening of May 4, 1547. Many of his generals, such as the Prince of Orange, cautioned the emperor against engaging Saxon troops on the other side. On the other hand, John, the King of England, argued that he needed to take drastic action to take the Saxons by surprise. The following day, several members of the advance guard of the imperial army looked for a way to cross the Elbe.
“The guards along the Elbe proved a thorn in the emperor’s side—should they be alerted or know of the imperial crossing; all advantage would be lost.” In the twilight of the following day, before the sun had risen, the emperor ordered part of the imperial advance guard to advance to find a way to cross. Small groups of troops swam across the river, taking the Saxon guards by surprise under the cover of darkness. Meanwhile, John used the help of a local farmer to find a place within the river that would allow the whole army to ford through the river—while English longbowmen, in one of the final battles they participated in, helped prevent the destruction of a pontoon bridge. This allowed the imperial cavalry to pass safely across to the shore. The entire army finished its crossing by late afternoon—with Johann Friedrich completely unaware.
The
Battle of Köttlitz broke out on the evening of May 5, 1547. Of Charles’ entire army, he possessed some 25,000 men—including his Burgundian and German levies, English troops under John, and a small contingent of Hungarian cavalry sent by Maximilian that had bypassed the Saxon guards. Johann Friedrich’s army of 11,000 consisted primarily of peasant levies, but they were prepared to stand their ground and fight for their faith. Charles suffered an attack of gout on the day of battle—he was carried to the battlefield in a litter but extorted his troops:
“We fight for the true faith—our holy mother church!” The first cavalry assaults were led by King John of England—including his English cavalry and the Hungarian sortie the emperor had placed under his command.
“John II of England rode forth gloriously,” Charles Wriothesley wrote in his chronicle.
“A ghost has risen from Thérouanne; the young king continued where his predecessor had started. The Hungarians failed in the first charge, and the young king was nearly hit—a stray shot merely grazing his ear. The king commanded the right flank, comprised of the finest English cavalry… a second charge against the Protestant’s weaker flank helped the king deliver victory—and the field, to the emperor. Cries of ‘For St. George! For England!’ mingled with those praising the emperor in French and German amongst sundry other tongues…” The battle proved a complete rout—the enemy troops were scattered into the woodworks, and Johann Friedrich, the Elector of Saxony, was soon taken prisoner, having been wounded in the face. When news of his victory was delivered to the emperor, he had only one thing to say:
“Je suis venu, j’ai vu, Dieu a vaincu.” John and his English forces would depart from Germany following this final victory—returning home to England by the end of 1547.
Imprisoned, Johann Friedrich was now at the emperor’s mercy. Condemned in a court-martial, the elector was sentenced to death. Johann’s wife, Sybille of Cleves, still held Wittenberg and was prepared to defend the city to her last breath. As the imperial army was prepared to lay siege to the Saxon capital, Johann Friedrich was offered an option to receive a reprieve. Johann Friedrich signed the
Capitulation of Wittenburg in June 1547—resigning the electoral dignity to Duke Severin of Saxony as well as a significant portion of his territories, leaving Johann with only a piece of the Ernestine lands around Gotha, Weimar, and Coburg. In signing the agreement, Johann Friedrich’s punishment was commuted to a life sentence, and he to be imprisoned in Namur alongside Philip of Hesse.
“Wittenberg, the cradle of the Reformation, fell easily enough in the hands of the imperial forces.” Andreas Chyträus wrote of the fall of Wittenburg.
“Duke Severin of Saxony was formally granted the electoral dignity at Wittenberg Castle, and a celebratory Catholic mass was held shortly after that—perhaps the first in twenty years in Wittenberg.” Saxony’s realignment meant that one more secular elector joined the Catholic camp—leaving the Count Palatine as the sole Protestant. The fall of Wittenberg into the hands of the Catholic party was a profound shock that caused many reformers to lament. The Prince of Orange, one of the emperor’s imperial commanders, suggested Martin Luther be disinterred from his resting place in the
Schlosskirche. However, Charles dissuaded him:
“He is dead; there is no reason to disturb him now.”
Emperor Charles V at Köttlitz; Titian, painted c. 1548.
The League of Mühlhausen essentially collapsed following Johann Friedrich’s defeat. Some holdouts in northern Germany remained, and imperial troops under the command of Eric II, Prince of Calenberg, were ordered to deal with them. He had support from the Hanseatic City of Lübeck, which contributed significantly to the imperial victory at the
Battle of Adendorf, which allowed imperial authority to flourish in northern Germany once Calenberg’s army occupied Bremen. The
Bruderkrieg, which had begun with a boom, now ended in a small whimper. The city of Magdeburg, one of the last remaining holdouts against the emperor, conceded to imperial demands and agreed to pay the fines that would be levied against the city.
“Charles V emerged victorious from the Bruderkrieg,” one historian would write.
“But the Protestant faith was a pandora’s box—twenty years past, it was far too late to push it back into the box. But Charles, often hounded and suffering losses during his time as emperor, had succeeded where his grandfather and forefathers had failed—he had secured a victory over the princes who oft stood in the way of change… giving the emperor a unique chance to secure his position—both for himself and for the House of Habsburg.” Not long after securing his victory over the Protestants, Charles called for an imperial diet to be assembled at Augsburg. Rather than returning to the Low Countries, Charles declared that he would settle in Innsbruck to await the start of the diet. Refurbishments were ordered to the Innsbruck
Hofburg.
The Diet of Augsburg opened in 1548—while known in some circles as the
Diet of Reforms, others derided it as the
Iron Diet due to the tense atmosphere that pervaded inside it—primarily because of the emperor’s military force that controlled the diet from the outside. Aside from Charles, Maximilian and Elisabeth attended the diet, allowing Charles to meet his daughter-in-law for the first time.
“His Majesty was the perfect gentleman,” one courtier wrote.
“It was as if he was twenty years younger and speaking with his beloved Mary yet again.” The diet opened with routine business: Charles announced plans for Maximilian’s election as King of Romans, with the election to be held in the next year in Frankfurt. From there, Charles asked that his chancellor read his intentions for the diet and the empire: articles that would become known as the
Reformatio Imperii. The first options were primarily administration: part one concerned the
Reichsregiment, which was to be reformed into the
Fürstenregiment, a princely council based in Brussels that would be given some distinct organizational functions for the first time. Compared to the
Reichsregiment of Maximilian’s time, the
Fürstenregiment was to be dominated by the emperor, who would not only serve as chairman but hold final approval for all decisions made by the Fürstenregiment. Secondly, Charles called for the
Geheimer Pfennig to be permanently levied to fund the Fürstenregiment alongside the
Kammerzieler, which paid for the Imperial Chamber Court and the
Römermonat concerning collections for the imperial army. Like the previously mentioned tax, the imperial treasurer would handle the disbursement of the funds, with collections to be handled through the imperial circles.
Woodcut of the Diet of Augsburg, 1548—Soldiers stand prepared behind the emperor; AI Generated.
Other reforms were financial—mint regulations to help introduce economic parity between the different parts of Germany, standardize the coinage and help prevent debasement. Expansion of the Imperial postal service was ordered, with additional routes planned throughout Germany to truly connect the imperial capital in Brussels to the rest of the empire. Others were administrative—such as the reorganization of the Burgundian Imperial Circle to include the Duchy of Guelders, the County of Zutphen, and the territories of Utrecht, Groningen, Overjissel, and the County of Drenthe. The whole Burgundian inheritance and its expanded territories would be covered for the first time in one imperial circle. The Low Countries would remain attached to the Imperial Chamber Court’s jurisdiction and pay taxes equivalent to two electorates. Its war taxes would be comparable to three electorates. The final and most important reforms that Charles considered as part of his program concerned the territorial makeup within the empire, but primarily considering his own hereditary domains. The Reformatio Imperii decreed changes in the electoral challenge—Bohemia was to lose its electoral vote within the Electoral College; in exchange, the kingdom’s unique position and connection to the empire would be recognized as an
imperial dependency—which came along with freedom from future imperial laws. One attendee wrote:
“All waited for bated breath as the archchancellor spoke… his droning voice as he degreed that Bohemia’s vote—already in the hands of the House of Habsburg would instead pass to Burgundy…”
The most significant changes concerned the Burgundian inheritance in the Low Countries. In decreeing the transfer of the Bohemian vote to Burgundy, the
Reformatio Imperii revived the use of a title already used by the Holy Roman Emperors—that of the so-called
Kingdom of Burgundy, sometimes known as the Kingdom of Arles, that had existed in Provence. This kingdom would be spun off as an electorate, now to contain the Burgundian inheritance in the Low Countries—thus shifting Bohemia’s vote onto Burgundy. As part of the electoral inheritance law, this act helped further centralize the Burgundian Low Countries, ensuring they would remain together and be inherited by a single person. Another section concerned the
Privilegium Maius that had allegedly made Austria an Archduchy—with Charles decreeing the children of his line would bear the title of
Prince/Princess of Burgundy ahead of that of Archduke/Archduchess of Austria. Other changes concerned territorial adjustments for those of proven loyalty: Saxony, as mentioned, had passed to Severin, who had reduced the former electoral line to a tiny cluster of land. Brandenburg was allowed to absorb several districts within its domains—though not Magdeburg. Other victors were the spiritual electors and certain ecclesiastical principalities—which saw organizations of lands and territories within their favor, to make them stronger redoubts of the Catholic faith—while also increasing imperial power through the Concordat of Aix-la-Chapelle. The last statements concerned religion, and the Archchancellor was apparent as he spoke:
“The emperor asks that the Protestants behave quietly and cause no trouble; he is prepared to recognize their married clergy and the laity to receive communion of both kinds. He asks that the Protestants prepare a delegation to attend the Council of Bologna as soon as possible. If reconciliation is not truly possible, then the emperor is willing to be magnanimous in his reforms.” Some could not help but genuinely wonder—what exactly did that mean?