Question: The Lithuanian Crusade was a series of campaigns by the Teutonic Order, and the Livonian Order, they first conquered which tribe  Baltic tribe that lived in the southcentral part of contemporary Latvia, and northern Lithuania?
Context: Peace of Brześć Kujawski was a peace treaty signed on December 31, 1435 in Brześć Kujawski that ended the Polish–Teutonic War (1431–1435).  The treaty was signed in the aftermath of the Livonian Order's defeat at the hands of the allied Polish-Lithuanian force in the Battle of Pabaiskas (Wiłkomierz).  The Teutonic Knights agreed to cease their support to Švitrigaila (who tried to break the Polish-Lithuanian union) and in the future to support only Grand Dukes properly elected jointly by Poland and Lithuania.  The treaty did not change borders determined by the Treaty of Melno in 1422.  The Peace of Brześć Kujawski showed that Teutonic Knights lost their universal missionary status.  Teutonic and Livonian Order no longer interfered with Polish–Lithuanian affairs; instead Poland and Lithuania involved themselves in the Thirteen Years' War, the civil war in Prussia that tore it in half. The Lithuanian Crusade was a series of campaigns by the Teutonic Order and the Livonian Order, two crusading military orders, to convert the pagan Grand Duchy of Lithuania into Roman Catholicism.  The Livonian Order settled in Riga in 1202 and the Teutonic Order arrived to Culmerland in 1230s.  They first conquered other neighboring Baltic tribes – Curonians, Semigallians, Latgalians, Selonians, Old Prussians (see Livonian Crusade and Prussian Crusade).  The first raid against the Lithuanians and Samogitians was in 1208 and the Orders played a key role in Lithuanian politics, but they were not a direct and immediate threat until 1280s.  By that time the Grand Duchy of Lithuania was already an established state and could offer organized defense.  Thus for the next hundred years the Knights organized annual destructive "reise" (raids) into the Samogitian and Lithuanian lands but without great success: border regions in Samogitia and Suvalkija became sparsely inhabited wilderness, but the Order gained very little territory.  The Grand Duchy finally converted to Christianity in 1386, when Grand Duke Jogaila accepted baptism from Poland before his wedding to reigning Queen Jadwiga and coronation as King of Poland.  However, the baptism did not stop the crusade as the Order publicly challenged sincerity of the conversion at the Papal court.  Lithuania, together with its new powerful ally Poland, defeated the Order in the decisive Battle of Grunwald in 1410, which is often cited as the end of the Lithuanian Crusade.  The final peace was reached by the Treaty of Melno (1422). The State of the Teutonic Order (German: "Staat des Deutschen Ordens" ; Latin: "Civitas Ordinis Theutonici" ), also called Deutschordensstaat (] ) or Ordensstaat (] ) in German, was a crusader state formed by the Teutonic Knights or Teutonic Order during the 13th century Northern Crusades along the Baltic Sea.  The state was based in Prussia after the Order's conquest of the Pagan Old Prussians which began in 1230.  It expanded to include at various times Courland, Gotland, Livonia, Neumark, Pomerelia and Samogitia.  Its territory was in the modern countries of Estonia, Latvia, Lithuania, Poland, and Russia.  Most of the territory was conquered by military orders, after which German colonization occurred to varying effect. The Battle of Wilkomierz (see other names) took place on September 1, 1435 near Ukmergė in the Grand Duchy of Lithuania.  With the help of military units from the Kingdom of Poland, the forces of Grand Duke Sigismund Kęstutaitis soundly defeated Švitrigaila and his Livonian allies.  The battle was a decisive engagement of the Lithuanian Civil War (1432–38).  Švitrigaila lost most of his supporters and withdrew to southern Grand Duchy; he was slowly pushed out and eventually made peace.  The damage inflicted upon the Livonian Order has been compared to the damage of Battle of Grunwald upon the Teutonic Order.  It was fundamentally weakened and ceased to play a major role in Lithuanian affairs.  The battle can be seen as the final engagement of the Lithuanian Crusade. Saint George’s Night Uprising in 1343–1345 (Estonian: "Jüriöö ülestõus" , ] ) was an unsuccessful attempt by the indigenous Estonian population in the Duchy of Estonia, the Bishopric of Ösel-Wiek, and the insular territories of the State of the Teutonic Order to rid themselves of the Danish and German rulers and landlords, who had conquered the country in the 13th century during the Livonian crusade, and to eradicate the non-indigenous Christian religion.  After initial success the revolt was ended by the invasion of the Teutonic Order.  In 1346 the Duchy of Estonia was sold for 19,000 Köln marks by the King of Denmark to the Teutonic Order.  The shift of sovereignty from Denmark to the State of the Teutonic Order took place on November 1, 1346. The Battle of Durbe (Latvian: "Durbes kauja" , Lithuanian: "Durbės mūšis" , German: "Schlacht an der Durbe" ) was a medieval battle fought near Durbe, 23 km east of Liepāja, in present-day Latvia during the Livonian Crusade.  On 13 July 1260, the Samogitians soundly defeated the joint forces of the Teutonic Knights from Prussia and Livonian Order from Livonia.  Some 150 knights were killed, including Livonian Master Burchard von Hornhausen and Prussian Land Marshal Henrik Botel.  It was by far the largest defeat of the knights in the 13th century: in the second-largest, the Battle of Aizkraukle, 71 knights were killed.  The battle inspired the Great Prussian Uprising (ended in 1274) and the rebellions of the Semigallians (surrendered in 1290), the Couronians (surrendered in 1267), and the Oeselians (surrendered in 1261).  The battle undid two decades of Livonian conquests and it took some thirty years for the Livonian Order to restore its control. Semigallians (Latvian "Zemgaļi"; Lithuanian: "Žiemgaliai" , also Zemgalians, Semigalls, Semigalians) were the Baltic tribe that lived in the southcentral part of contemporary Latvia and northern Lithuania.  They are noted for their long resistance (1219–1290) against the German crusaders and Teutonic Knights during the Northern Crusades. The Truce of Łęczyca was signed during the Polish–Teutonic War (1431–1435) between the Kingdom of Poland and the Teutonic Order in Łęczyca on 15 December 1433 (this has also led some Polish historians to divide this Polish–Teutonic War into two wars, in 1431–1433 and in 1435).  The Teutonic Knights, pressured by the citizens of their lands, agreed to the 12-year-old truce to other Polish demands, including that the Order would cease support to Švitrigaila (a Lithuanian noble who attempted to break the Polish-Lithuanian union with the aid of the Order); in addition each side would control the territories it occupied until a peace would be signed ("uti possidetis"), and no party would seek mediation of foreign powers to change this truce.  This marked the end of the war on Polish territories; the struggle on Lithuanian lands would continue for two more years (as the truce with Poland did not extend to the Livonian Order). The Battle of Skuodas or Schoden was a medieval battle fought in ca. 1259 near Skuodas in present-day Lithuania during the Lithuanian Crusade.  The Samogitian army of 3,000 invaded Courland and on their way back defeated the Livonian Order, killing 33 knights and many more low-rank soldiers.  In terms of knights killed, it was the eighth largest defeat of the Livonian Order in the 13th century.  This victory led to a Semigallian insurrection against the Livonian crusaders, which lasted from 1259 to 1272. The Curonians or Kurs (Curonian: "Kursi"; German: "Kuren" ; Latvian: "kurši" ; Russian: курши ; Lithuanian: "kuršiai" ; Estonian: "kuralased" ; Polish: "Kurowie" ) were a Baltic tribe living on the shores of the Baltic Sea in what are now the western parts of Latvia and Lithuania from the 5th to the 16th centuries, when they merged with other Baltic tribes.  They gave their name to the region of Courland ("Kurzeme"), and they spoke the Old Curonian language.  Curonian lands were conquered by the Livonian Order in 1266 and they eventually merged with other Baltic tribes participating in the ethnogenesis of Lithuanians and Latvians.  Direct descendants of the Curonians include the Kuršininkai of the Curonian Spit and the so-called Curonian Kings of Courland.
Answer: Semigallians