The German plan to take Murmansk: The failure of Silberfuchs was to have a lasting effect on the course of the war. While the rest of the Russian lines had collapsed in 1941, the forces of R.I. Panin's Northern Front had held, causing severe casualties of up to 15% on the German attackers. German failure can be attributed to a number of factors: the terrain, first and foremost, hindered the advance, and the assault lacked a Schwerpunkt (point of maximum effort), the main factor in the successful Blitzkrieg strategy. The lack of a focus point for the German-Finnish attack meant that the necessary breakthrough was not possible, and the stagnation of the front was inevitable. The port of Murmansk was to remain in Russian hands throughout the war, and around a quarter of all lend lease material was received through this port (the remainder coming through Vladivostok (almost half), Persia (quarter) and Black Sea (rest). The supplies coming through this port helped the Soviets quickly recover from the disasters of 1941. The war in the north dragged on until September 1944, when the Finns sued for peace and the Lapland War began, but at no point was a decisive victory on this front a possibility.