That’s going back! Zooming ahead a little I’ve always been fascinated with Kharkov because it changed hands 3 times between 41-43 or so.
Aside from Case Yellow, my favorite WW II camapaign is Rommel’s 1942 operation starting at Gazala, and ending with hustling the Brits out of Mersa Matruh. For sheer size, you can’t beat the Kiev encirclement of 1941.