Polish–Lithuanian–Teutonic War

• 1. Introduction

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  The Polish-Lithuanian-Teutonic War, also called the Great Teutonic War, began not with a grand declaration but with a peasant uprising in a disputed strip of land called Samogitia. The year was 1409, and that uprising set off a chain of events that would end the military dominance of one of the most formidable crusading orders in European history. How did a conflict over a single territory spiral into one of the largest pitched battles of the medieval age? Why did the victors fail to press their advantage? And what did a war lasting less than two years do to reshape the balance of power across an entire continent for generations to come?

• 2. A Century of Holy War

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  In 1230, the Teutonic Knights moved into the Kulmerland at the request of Konrad I, king of the Masovian Slavs, to wage the Prussian Crusade against the pagan Prussian clans. Backed by both the Pope and the Holy Roman Emperor, these military-religious monks conquered and converted the Prussians by the 1280s. Their next target was the Grand Duchy of Lithuania, which remained pagan, and for roughly a hundred years they raided Lithuanian lands, focusing especially on Samogitia.

  Samogitia held an almost strategic value that went beyond its modest size: it was the one territory separating the Teutonic order's Prussian branch from its branch in Livonia. The Lithuanians first gave up Samogitia during the Lithuanian Civil War of 1381-84, under the Treaty of Dubysa. That concession was essentially a bargaining chip, traded to secure Teutonic support for one side in an internal power struggle.

  The religious rationale for the Knights' campaigns crumbled when, in 1385, Grand Duke Jogaila of Lithuania proposed marriage to reigning Queen Jadwiga of Poland under the Union of Kreva. Jogaila converted to Christianity and was crowned King of Poland, creating a personal union between Poland and Lithuania. The Knights responded not by accepting the new reality, but by publicly contesting whether Jogaila's conversion was sincere, taking the charge to a papal court. Samogitia remained in Teutonic hands under the Peace of Raciąż of 1404, and the dispute was far from settled.

• 3. Diplomatic Chess Before the Clash

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  Teutonic Grand Master Ulrich von Jungingen declared war on Poland and Lithuania on the 6th of August 1409, after the Samogitian uprising drew both countries into the crisis. The Knights moved fast, invading Greater Poland and Kuyavia in hopes of defeating the two allies separately. They burned the castle at Dobrin, captured Bobrowniki after a fourteen-day siege, and seized Bydgoszcz before the Poles organized counterattacks and took Bydgoszcz back.

  Neither side was truly prepared for a full-scale war, and Wenceslaus, King of the Romans, stepped in to broker a truce. Signed on the 8th of October 1409 and set to expire on the 24th of June 1410, that truce became nine months of intense preparation and political maneuvering. Wenceslaus, who received a gift of 60,000 florins from the Knights, ruled that Samogitia rightfully belonged to the Order and that only Dobrzyń Land should be returned to Poland. The Knights also paid 300,000 ducats to Sigismund of Hungary, hoping he would supply military reinforcements.

  Sigismund's involvement carried a subtler aim. He offered Vytautas, the Grand Duke of Lithuania, a king's crown. Acceptance would have violated the Ostrów Agreement and fractured the Polish-Lithuanian alliance. Vytautas declined, and simultaneously secured a truce from the Livonian Order, removing the threat of a second front. By December 1409, Jogaila and Vytautas had agreed on a single, unified strategy that the Teutonic Knights did not anticipate: their armies would merge into one massive force and march directly on Marienburg, the order's capital.

• 4. The March to Grunwald

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  The joint Polish-Lithuanian army assembled at Czerwinsk, a rendezvous point about 80 km from the Prussian border. From the 24th to the 30th of June 1410, the entire force crossed the Vistula River over a floating bridge, a logistically complex feat requiring precise coordination among troops of many different ethnicities. Masovian contingents under Siemowit IV and Janusz I joined the march afterward. The combined army moved north toward Marienburg starting on the 3rd of July, crossing the Prussian border on the 9th of July.

  Ulrich von Jungingen had concentrated his main forces at Schwetz, a central position from which he could respond to what he expected would be two separate invasions: Poles advancing along the Vistula toward Danzig, Lithuanians pushing along the Neman toward Ragnit. When he grasped the actual plan, he left 3,000 men at Schwetz under Heinrich von Plauen and led the rest to the Drewenz River near Kauernik, hoping to hold a strong defensive line.

  On the 11th of July, Jogaila declined to force a crossing at that fortified position and turned his army east, skirting the Drewenz toward its headwaters and bypassing the Teutonic line. Von Jungingen followed in parallel. When the Polish-Lithuanian forces ravaged the village of Gilgenburg, von Jungingen was reportedly so angered by the violence that he swore to bring the invaders to battle. Both armies converged near three villages: Grunwald, Tannenberg, and Ludwigsdorf.

• 5. The Battle of Grunwald

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  On the 15th of July 1410, the two armies met in one of the largest battles of medieval Europe. Modern estimates place Polish-Lithuanian forces at somewhere between 16,500 and 39,000 men, with the Teutonic side numbering between 11,000 and 27,000. The alliance fielded a strikingly diverse force: Roman Catholic Poles and Lithuanians stood alongside pagan Samogitians, Eastern Orthodox Ruthenians, and Muslim Tatars. Twenty-two different peoples, mostly Germanic, fought for the Teutonic side.

  The Knights opened with a provocation, sending two ceremonial swords to Jogaila and Vytautas, later known as the Grunwald Swords, with the message that the swords would "assist" them in battle. The Lithuanian cavalry attacked first, and after more than an hour of heavy combat, it began a full retreat. Whether that retreat was a genuine collapse or a deliberate tactical feint remains a subject of academic debate. Whatever the reason, Polish forces bore the full weight of the Teutonic response, and the fighting grew so intense that it reached Jogaila's royal camp. One Teutonic knight charged directly at the king; royal secretary Zbigniew Oleśnicki intervened and saved Jogaila's life.

  The Lithuanians returned to the field. Grand Master von Jungingen, attempting to break through the Lithuanian lines personally, was killed. Leaderless and surrounded, the Teutonic Knights fell back toward their camp, hoping to form a defensive wagon fort. The defense collapsed. An eyewitness account reported that more Knights died in the camp than on the battlefield itself. Roughly 8,000 Teutonic soldiers were killed. An additional 14,000 were taken captive. Most of the brothers of the Order, including most of its senior leadership, died that day. The highest-ranking Teutonic official to escape was Werner von Tettinger, Komtur of Elbing.

• 6. Victory Withheld

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  After the battle, the Polish and Lithuanian forces stayed on the Grunwald field for three days, then advanced on Marienburg at roughly 15 km per day. The main army did not reach the heavily fortified Teutonic capital until the 26th of July. That delay gave Heinrich von Plauen, who had been left at Schwetz with 3,000 men, sufficient time to organize the city's defenses.

  Polish historian Paweł Jasienica advanced the argument that the slow advance may have been deliberate. Jagiełło and Vytautas may have preferred to keep the order weakened but intact rather than destroyed outright, since a total Teutonic collapse would have left Poland as the dominant heir to most of the order's vast territories, potentially upsetting the internal balance between the two allies. No primary sources resolve the question definitively.

  Meanwhile, Jogaila's forces took the Teutonic cities of Danzig, Thorn, and Elbing, among others, with many fortresses surrendering without resistance. Only eight Teutonic castles held out. But the besieging army at Marienburg was suffering: ammunition was short, morale was low, and an epidemic of dysentery spread through the ranks. Sigismund of Hungary, Wenceslaus, and the Livonian Order each promised aid to the besieged Knights. The siege was lifted on the 19th of September. The Knights then moved quickly to recapture most of the fallen castles, and by the end of October only four border castles along the Teutonic frontier remained in Polish hands. Jogaila responded by raising a fresh army, which defeated the Knights again at the Battle of Koronowo on the 10th of October 1410.

• 7. The Price of Peace

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  The Peace of Thorn, signed on the 1st of February 1411, gave Poland the Dobrzyń Land and forced the Knights to relinquish their claims on Samogitia during the lifetimes of Jogaila and Vytautas. It was a modest territorial outcome for a victory as complete as Grunwald. Two more wars, the Hunger War of 1414 and the Gollub War of 1422, had to be fought before the Treaty of Melno in 1422 finally resolved the boundary disputes.

  The financial terms of the peace, however, cut deeper than any border adjustment. The Knights were required to pay a silver indemnity estimated at ten times the annual income of the King of England, in four installments. To meet those payments, the order borrowed heavily, confiscated gold and silver from churches, and raised taxes. Two of the order's major cities, Danzig and Thorn, revolted against the increases.

  The order's recruitment problem compounded its financial crisis. Because both Poland and Lithuania were now Christian kingdoms, the religious justification for crusading volunteers had evaporated. The Grand Masters were forced to rely on hired mercenaries, an ongoing drain on an already depleted treasury. Internal conflicts deepened alongside economic decline and the burden of taxation. In 1441, major Prussian cities and nobility formed the Prussian Confederation, also called the Alliance against Lordship, in direct response to Teutonic misrule. That confederation's grievances eventually ignited the Thirteen Years' War in 1454, a conflict that would mark the next decisive chapter in the order's long decline.