In 1236, Duke Vykintas led the Samogitian forces to victory in the Battle of Saule, where the Livonian Order suffered a catastrophic defeat. It seems that Vykintas did not receive support from Mindaugas. Vykintas' personal power grew. The Livonian Order was on the brink of collapse and was forced to become a branch of the Teutonic Knights. The combined Orders focused on the conquest of Samogitia, since only this land prevented them from consolidating their territories. The union of these aggressive powers could not have passed without notice in Lithuanian lands, and might have furthered the unification process. In about 1239 Mindaugas took over the weakened Black Ruthenia and appointed his son Vaišvilkas to govern it. During the early 1240s, Mindaugas strengthened and established his power in various Baltic lands. In 1245, Mindaugas sent his nephews Tautvilas and Edivydas, the sons of Dausprungas and Vykintas, to conquer Smolensk, but they were unsuccessful. In 1249, an internal war erupted as Mindaugas sought to seize his nephews' and Vykintas' lands.