This whole mounted/dismounted is an interested point and the reason I asked about fighting from the vehicles.
I guess the whole focus of the game at the tacical level means a that a lot of activity can be assume to have happen before the start of a particular scenerio ie, to troop are at the start line and beginning the assault, so have already debussed.
My question about fighting/firing from vehicles was aim at latter war scenerios where for example panzer grenadier troops would fight into a position and then debus.