Two-Front War—fighting a war simultaneously on two different “sides” (fronts) at once
Schlieffen Plan—a strategy supposedly developed by a high-ranking German officer for a speedy victory in WWI: attack the Western Front (France) first, because it is industrialized—once France is defeated, the German Army could then concentrate on the Eastern Front (Russia), which would be slow to move troops to the front with a lack of industrialization, railroads, etc.
Trench Warfare—a stalemate in war wherein both sides dig “trenches” and attempt to occupy the opposing army’s trench by crossing “no-man’s-land”
U.S.S.R.—the Union of Soviet Socialist Republics: the name of Communist-controlled Russia and other federated states from roughly 1917 until 1991 (so “Russians” were known as “Soviets” during this time period)
Armistice—a “cease-fire” agreement that ends the fighting—it does not end a state of war (only a treaty can do that)