If you go BlitzKrieg for Wehrmacht, or use Knights Cross, the "Grenade Assault" Ability will not kill Soviet Infantry, although, it does damage and stun them. The Grenades will bring the infantry to ABOUT 1% health (if they are all bunched together) but no infantrymen/engineers will die. Its no real biggy, it has the same effects on them and does do some major damage to them. I was playing Stalingrad BTW, if that matters