real danger to the Teutonic Knights, who could concentrate on further conquests. The number of uprisings is variously considered to be two or three. They were suppressed within a year or two and showed exhaustion and division of the Prussian tribes. The third uprising in 1276 was provoked by Skomantas, leader of the Sudovians, who successfully raided Teutonic lands. The next year he, with help from the Lithuanians, led 4,000 men into the Culmerland (Chełmno Land). The uprising failed to spread after Theodoric, vogt of Sambia, convinced the Sambians not to join the insurrection; Natangians and Warmians had also accepted baptism and promised their loyalty to the Knights. The Pogesanians alone continued the fight and were crushed. Survivors with their Bartian chief escaped to Hrodna in the Grand Duchy of Lithuania where they joined some of the Bartians, Skalvians, and all of the Nadruvians, who fled there after the Great Uprising. The last two Prussian attempts to rid itself of the Teutonic rule were made relying on the foreign powers who were enemies of the Knights. The first one in 1286, also known as the fourth uprising, depended upon help from the Duke of Rügen, the grandson of Swantopolk. The plot was soon revealed and the Bartians and Pogesanians suffered the consequences. In 1295 the last uprising was limited to Natangia and Sambia and depended upon help from Vytenis, Grand Duke of Lithuania. The rebels captured Bartenstein (Bartoszyce) by surprise and plundered as far as Königsberg, but were never a serious threat. By that time Prussian nobility was already baptized and pro-Teutonic to the extent that peasants killed them first before attacking the Knights. This last attempt effectively ended the Prussian Crusade and the Knights concentrated on conquering Samogitia and Lithuania. Lithuanian historians note that fierce resistance by the Prussians won time for the young Lithuanian state to mature and strengthen so it could withstand the hundred-year crusade, culminating in the 1410 Battle of Grunwald, with minimal territorial losses. The Prussian lands were repopulated by colonists from Germany, who after the 16th century eventually outnumbered the natives. It is estimated that around 1400 Prussians numbered 100,000 and comprised about half of the total population in Prussia. The Prussians were subject to Germanization and assimilation and eventually became extinct sometime after the 16th century. It is believed that the Prussian language became extinct sometime at the beginning of the 18th century.