I would have planned my attack a bit different as Germans knowing I had reinforcements. Realisticly as a field commander, I would have waited the 10 minutes for all of my units to arrive before commiting to the attack anyway, so as to better coordinate it. Overwhelming guns/manpower is the name of the game, not commiting small units piece-meal.
Good scenario, but all the German units should have started on the map. Cya in round 2.