Blitzkrieg (lightning war) was Germany's most successful military strategy at the beginning of WWII, involving rapid, coordinated attacks using tanks, aircraft, and mobile infantry to overwhelm enemy defenses quickly. This tactic proved devastatingly effective against Poland, France, and other European nations in 1939-1940. Panzer refers specifically to tank units (part of Blitzkrieg), Luftwaffe is the air force (also part of Blitzkrieg), and 'Assasins' is not a recognized German military strategy.