Both German crusaders and Lithuanians endangered the safety of Russian lands. In 1268, he sent his forces to Novgorod to assist his Russian vassals to conquer Danish Estonia, but after the battle of Wesenberg was forced to withdraw. In 1274 Smolensk, the last of Russian principalities, became subject to Möngke Temür khan of the Golden Horde. The Khan also dispatched his army along with Russian princes to Lithuania by the request of the duke Lev of Galicia-Volhynia in 1275.