The Eastern Front is the theater of war in eastern Europe, especially in World War II. It chiefly denotes the brutal campaign between Nazi Germany and the Soviet Union. In World War I, it referred to battles between the Central Powers and Russia.
Allied supplies of arms to Russia, and the manpower reserves of Russia have been sufficient to bring continuous counter-attacks against our Eastern Front. Hjalmar Schacht
The Eastern front is like a house of cards. If the front is broken through at one point all the rest will collapse. Heinz Guderian
Additionally, units could be halted by mud ( thawing along the Eastern Front regularly slowed both sides) or extreme snow. Source: Internet
After several years of war and heavy losses on the Eastern Front, the German army was forced to rely more heavily on enrolling teenage soldiers. Source: Internet
A three-month quiet period descended upon the Eastern Front as the Soviets prepared their defences and the Germans attempted to build up their forces. Source: Internet
Clark, Lloyd, Kursk: The greatest battle: Eastern Front 1943, 2011, page 164–165 Vasily Chuikov October 1942: A German Oberleutnant (1st Lieutenant) with a Soviet PPSh-41 submachine gun in Barrikady factory rubble. Source: Internet