The Battle on the Ice (; , Ledovoye poboishche; ), alternatively known as the Battle of Lake Peipus (), took place on 5 April 1242. It was fought largely on the frozen Lake Peipus between the united forces of the Republic of Novgorod and Vladimir-Suzdal, led by Prince Alexander Nevsky, and the forces of the Livonian Order and Bishopric of Dorpat, led by Bishop Hermann of Dorpat. The battle was significant because its outcome determined whether Western Catholicism or Eastern Orthodox Christianity would dominate in the region. In the end, the battle represented a significant defeat for the Catholic forces during the Northern Crusades and brought an end to their campaigns against the Orthodox Novgorod Republic and other Slavic territories for the next century. The event portrayed in Sergei Eisenstein's historical drama film, Alexander Nevsky (1938), later created a popular but inaccurate image of the battle. Background In 1221, Pope Honorius III was again worried about the situation in the Finnish-Novgorodian Wars after receiving alarming information from the Archbishop of Uppsala. He authorized the Bishop of Finland to establish a trade embargo against the "barbarians" that threatened Christianity in Finland. The nationality of the "barbarians", presumably a citation from Archbishop's earlier letter, remains unknown, and was not necessarily known even by the Pope. However, as the trade embargo was widened eight years later, it was specifically said to be against the Russians. Based on Papal letters from 1229, the Bishop of Finland requested the Pope enforce a trade embargo against Novgorodians on the Baltic Sea, at least in Visby, Riga and Lübeck. A few years later, the Pope also requested the Livonian Brothers of the Sword send troops to protect Finland. Whether any knights ever arrived remains unknown. Although the missionaries and Crusaders had attempted to establish peaceful relations with the Novgorod Republic, Livonian missionary and crusade activity in Estonia caused conflicts with Novgorod, who had also attempted to subjugate, raid and convert the pagan Estonians. The Estonians also sometimes attempted to ally with the Russians against the Crusaders. In 1240 the combined forces of Teutonic Knights, other Germans from Estonia, Danish vassals from Estonia, and the exiled Prince of Pskov Yaroslav Vladimirovich attacked the Pskov Republic and Votia, a tributary of Novgorod. This triggered the counterattack from Novgorod. Hoping to exploit Novgorod's weakness in the wake of the Mongol and Swedish invasions, the Teutonic Knights attacked the neighboring Novgorod