Makes sense - an 80-90mm mortar shell ain't just gonna bounce off and do nothing to tank, especially when the armour on the top of the turret is not going to be as thick as the front
Will have to try it out in FH2 one day - it's always a blast having a couple of mortar squads, with a pak38 coverring a position in COH and watching allied M10s get blasted to pieces by mortars
now to re-create that in fh2 would be nice