125mm shells for soviet tanks, 120mm smoothbore for Leopards 2, 120mm rifled for Challenger and 105mm for Leopard 1

The Ukes seem to be outgunned.

Recall the German 88s on their Panzers vs the 67mm guns on the U.S. tanks. Those 88s would slice thru the U.S. tanks like a hot knife thru butter.

The Americans were at a disadvantage until late in the war when the Pershing tanks with a 90mm cannon came into the fray. ;)