StAs the first anniversary of Operation Barbarossa approaches, the Soviet high command knows that the Germans are planning another major offensive. But the Germans have a way of surprising their enemies. 

Map 1: The Soviets push back the Germans, winter 1942

Map 2: German Case Blue objectives, 1942

Map 3: Leningrad front

Sturmgeschutz III self-propelled assault gun 

Karl-Gestat super-heavy mortar

Sources:

Clayton Donnell, The Defence of Sevastopol, 1941–1942: The Soviet Perspective. South Yorkshire, UK: Pen & Sword Military Books, 2016.

Anthony Tucker-Jones, Slaughter on the Eastern Front: Hitler and Stalin's War 1941–1945. Stroud, Gloucestershire, UK: The History Press, 2017.

Antony Beevor, The Second World War. London, UK: Little, Brown and Co., 2012. 

Wikipedia: Timeline of the Second World War, 1942

— Karl-Gerat https://en.wikipedia.org/wiki/Karl-Gerat

— Lend-Lease https://en.wikipedia.org/wiki/Lend-Lease