My favorite recent moment is from an AOD CORE game as USSR. I was playing normal difficulty with some custom industrial modifiers (+25% IC/MP for USSR and +500% IC/MP for Axis, plus 100 IC, 3 daily MP, and a bunch of resources worth of offmap production for Germany, and smaller proportions for other Axis). This all is because I like playing with large armies. The German division count peaked at about 1,200, and had been attritionally whittled down to about 1,000 circa 1947, while the USSR had built up to about 575 divisions on the main front and was ready to go over onto the offensive (which was the river line from Riga to Melitopol - there was a secondary front in the southern Balkans held by about 90 USSR MTN divisions and a handful of misc. divisions, but that had no prospects other than staying on the defensive).
Rather than try, and probably fail, to punch through the German front line across the rivers, I went a bit out of character for the USSR and performed an enormous amphibious encircling maneuver, landing around 180 mech divisions (in numerous waves) in Kherson and driving north while rolling up the German line by multi-direction attacks on each successive new southern-flank province. Kiev was liberated in about forty days, shortly after which the rolling-up ran out of steam in the face of reconstituted German lines and counterattacks, but before that happened Germans lost, I guess around 250 to 300 divisions to either overruns (mostly), encirclements (some, mostly pretty overrunny encirclements rather than traditional), or sheer strength damage from four or five lost defensive battles in a row.
Not the end of the war, which took another year and a half of very heavy fighting and sent me scrabbling for any spare drop of manpower (even disbanded the same transports I used to start the whole thing, and still ended way in the red). But thanks to the damage wrought in those first forty days (after about five years of prep!), the USSR was able to keep moving - slowly, bloodily - forward.
