It's the spring of 1942. As the German Wehrmacht and Luftwaffe rebuild, the high command plans a new offensive in the east. Meanwhile, the Soviets strike back in Crimea and Kharkiv. 

Map 1: The Crimean peninsula

Map 2: Kerch peninsula

Map 3: The Second Battle of Kharkiv

Sources

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

Ray Harris, The History of World War II podcast. https://worldwariipodcast.net 

David Glantz, Operation Barbarossa: Hitler's Invasion of Russia 1941. Stroud, Gloucestershire: The History Press, 2011

David Stahel, Operation Typhoon: Hitler's March on Moscow, October 1941. Cambridge, UK: Cambridge University Press, 2013.

David Stahel, Operation Barbarossa and Germany's Defeat in the East. Cambridge, UK: Cambridge University Press, 2009.