Beginnings and Vytenis's rule (1283–1315) In 1283, chronicler
Peter of Dusburg noted that the Teutonic Order finalized its
conquest of Prussia and of the
Yotvingians. Some Yotvingians retreated to Lithuania, and some the crusaders deported to Sambia. The Lithuanian Crusade began in the winter of 1283. hillfort, 2010 The first target of the Teutons was
Bisenė on the western Lithuanian border. Poland became more hostile toward the Teutonic Order due to their dispute over the dominion of
Pomerania. As a result, Łokietek stipulated an anti-Teutonic defensive military pact with Gediminas in 1330–1331. In the winter of 1329, King
John of Bohemia formed an army to participate in the crusade. Strengthened by this support, the knights of the order were able to capture several important fortresses in Samogitia. Conflicts with the king of Poland and limited contributions from John of Bohemia delayed the conquest of further territories. Seeing their defeat, the defenders burned the fortress's goods and killed themselves. Once the fortress was conquered, the Teutonic Knights replaced it with a new fortification they baptized
Bayernburg () in honor of Henry XIV. They hoped the fort would serve as a foothold for further campaigns into the region. After the withdrawal of most of the order's army, Bayernburg was stormed and destroyed by Lithuanian troops led by Gediminas in person. According to local tradition, he was shot by an arrow under an oak tree that still exists outside the fortifications. He more likely died in 1341, a year in which the fighting temporarily subsided.
The brothers Algirdas and Kęstutis (1345–1382) The conflict intensified again in 1345 after two sons of Gediminas,
Algirdas and
Kęstutis, assumed power by ousting their brother,
Jaunutis, who had been Gediminas's heir. The two shared control of the territory as a
duumvirate: the land to the southeast was controlled by Algirdas and the land to the west (including Samogitia) was administered by Kęstutis. As a result, Kęstutis led most of the fight against the Teutonic Order, with mixed results. In 1349, Teutonic commander
Winrich von Kniprode seized a victory against the Lithuanians in the
Battle of Strėva, which was held in an open field. In 1352, led by von Kniprode, now
grand master of the Teutonic Order, the Teutonic State began a period of quiet growth and avoided disagreements with the Kingdom of Poland. In 1358, Holy Roman Emperor
Charles IV expressed a desire for peace if the Lithuanian sovereign would accept Christianity. Algirdas stipulated the complete withdrawal of the Teutonic Order from the Baltic region, which Charles IV rejected because he needed support from the order. The war only ended in 1361 when a marshal of the order,
Henning Schindekopf, and
Louis I of Hungary succeeded in capturing Kęstutis. The poet and herald
Peter Suchenwirt wrote a poem to commemorate the capture, when Kęstutis apparently swore an oath to convert to Christianity. Kęstutis successfully escaped from his imprisonment in
Malbork Castle in 1362. That April, a Teutonic army destroyed the
Kaunas Castle, which was situated well within the borders of the Grand Duchy of Lithuania. That success marked the beginning of a period of mutual devastation that only ended when both adversaries were significantly weakened. Between 1362 and 1370, the crusaders made 20 "punitive expeditions" into Lithuania. (They would complete 52 by 1382.) In response, Kęstutis and Algirdas gathered military contingents from all of Lithuania, from Russian feudal lords faithful to the grand duchy, and from the
Tatars who were disposed to help because they shared a border with the Teutonic State near
Königsberg. By February 1370, conditions were right for the large
Battle of Rudau. The Teutonic army seized victory despite their inferior numbers because they were more comfortable in open-field combat. Through these advancements, the still well-manned Teutonic Order raided the Lithuanian capital,
Vilnius, and populous
Trakai. The Lithuanians retaliated with sporadic raids.
Lithuanian and Polish power struggles (1386–1409) A new phase began in 1377 with the death of Algirdas. In Lithuania, a power struggle erupted between Algirdas's sons, Kęstutis, and Kęstutis's son
Vytautas. Alternating alliances were forged with former opponents to the north and west since the question of Christian conversion had lost energy in the preceding century. In 1380, with the secret
Treaty of Dovydiškės, the Teutonic Order supported Algirdas's heir,
Jogaila, against Kęstutis in exchange for various concessions. While Kęstutis remained a prisoner of Jogaila through 1382, Vytautas escaped and fled to his cousin in the Teutonic State, trusting in their help to depose Jogaila and his allies. There, he converted to Christianity. This power struggle ended in the summer of 1384, leading to a pause as the
Christianization of Lithuania progressed. Jogaila went to the Polish nobility, the
szlachta, to ask to marry Queen
Jadwiga of Poland. Their conversations about the marriage and Jogaila's converting to Christianity created a more stable relationship between Poland and the Grand Duchy of Lithuania. The treaty of the agreement, the
Union of Krewo, set the two countries on a path of increasing closeness, eventually leading to the
Polish–Lithuanian union. Jogaila was also forced to enter an understanding with his cousin Vytautas to accept Vytautas's claims and return his possessions. Jogaila (now given the name Władysław II Jagiełło) was elected king of Poland after being baptized and marrying Jadwiga in 1386. Lithuania, the last pagan state in Europe, embraced Christianity. The
Lithuanian nobility were skeptical about assimilating into Polish culture, so Jagiełło had to concede more rights to Vytautas, who wanted to expand east into the
Grand Duchy of Moscow and needed more freedom for military action. Vytautas transferred his rights to Samogitia to the Teutonic Order in the
Treaty of Salynas of 1398. The act was also ratified by Jagiełło as king of Poland in 1404.
Growing instability of the Teutonic Order (1409–1410) The leaders of the Teutonic Order were skeptical and uncertain about their future in the region after Jogaila accepted the Polish crown and Christianity while maintaining close ties to Lithuania. These doubts created ideological and military problems for the order. Lithuanian conversion challenged the order's status as fighting against paganism, which it had heralded so much in the preceding decades. The order argued that the Lithuanian baptisms had been only for political goals and that the majority of Lithuanians held on to
their traditional beliefs. Denying the possibility of mass baptisms, Vytautas and Jagiełło asked
Pope Boniface IX to intervene. The Pope's response arrived in 1403, a
papal bull forbidding the Teutonic Knights from declaring war on Lithuania. The Teutonic Order was worried by the response. The Kingdom of Poland, situated to the south, sheltered the monastic state and allowed it to grow throughout the unstable 15th century. After the order's annexation of Pomerania in 1309 and the
Polish–Teutonic War of 1326–1332, Polish nobility grew hostile to the order. Their rejection compounded with the enduring hostility of the Lithuanians, creating tension on the order's southern and eastern borders. The
Golden Horde's defeat of Vytautas in the 1399
Battle of the Vorskla River completely changed Lithuanian foreign politics. Before then, the Lithuanians focused on eastward expansion. Now they changed their objectives and again concentrated on Samogitia. Given the local discontent against the Teutonic Order, Vytautas considered resuming hostilities. Although the papal bull of 1403 ordered concessions to the feudal lords of Lithuanian regions, the order was not charitable. In order-controlled territories, Lithuanian discontent grew due to the ecclesiastical tithes and the restrictive regime imposed by the merchants of the Teutonic State. When it imposed a new round of tributes on the populus, the threat of a popular uprising became concrete.
Battle of Grunwald and peace treaties (1410–1422) Carefully timed letters of protest from the people of Samogitia reached the
Roman Curia at the same time as those of numerous European courts and guilds of cities in eastern Europe. Fomented by Grand Duke Vytautas, the first
Samogitian uprising seized the region from 1401 to 1404 and ceased when a peace treaty was signed that recognized the crusaders' authority over the region. In 1409, Vytautas argued for a second insurrection. With open support for rebellion in Teutonic Order territory, Grand Master
Ulrich von Jungingen called for war. On August 6, 1409, von Jungingen's herald brought a formal challenge from the order to the king of Poland. This signaled the beginning of the (Great Quarrel), as the Teutonic Knights called the
Polish–Lithuanian–Teutonic War. The order began by invading
Greater Poland and seizing many castles. In the fall of 1409, a brief armistice was negotiated with the mediation of
Wenceslaus IV of Bohemia. On July 15, 1410, the combatants met in the historic
Battle of Grunwald. The Teutonic Order was soundly defeated and entered a period of crisis. Despite his advantage after his victory, Polish king Jagiełło did not pursue a decisive, swift coup against the Teutonic Order, which gave the order time to defend their remaining positions. With the
Peace of Thorn of 1411, the Teutonic Order agreed to release Samogitia and make reparations for razed fortifications. The order stopped making incursions against the Lithuanians, who had by then mostly converted to Christianity due to Polish influence. But the order succeeded in negotiating for lighter sanctions overall thanks to the intervention of
Sigismund of Luxembourg, the Holy Roman Emperor. Some authors consider the Peace of Thorn the conclusion of the Lithuanian crusades. In 1413, the new Teutonic grand master,
Heinrich von Plauen, opposed the arbitration of an imperial envoy, Benedikt Makrai, who had assigned the Neman's east riverbank to the Lithuanians. Because of his opposition, he was deposed by
Michael Küchmeister von Sternberg. Understanding the fragility of the order at that moment, von Sternberg sought peace with Poland. However, when he also refuted Makrai's decision, the Polish invaded
Varmia to begin the
Hunger War of 1414. Defeated, the order renounced their claim. There was an extended period of truce-making and negotiations, which were extremely costly for a Teutonic Order already weakened by wars and reparations. At the Council of Constance, the order had to justify its military actions. The situation became so financially precarious for the order that it had to cut military spending, a drastic shift compared to previous centuries. The Lithuanian borders were only stabilized after the brief
Gollub War in 1422, with the
Treaty of Melno. The demarcations of the treaty would remain unchanged for nearly 500 years and end with the Lithuanian occupation of the
Klaipėda region in 1923. ==Military strategy==