[Fritztoten]

I need some tips for completeing the (I believe) 6th mission, its the mission where you have to get the King Tiger Tank across the bridge, and also you can call in Arty. So when is it the BEST time to call the Arty in??? It tells you to sneak up and take out the guards near the bridge so they cant set off the explosives, but theres NO WAY to sneak up on anyone in this game. Even if I'm hiding in a bush, or behind a rock, etc... they ALWAYS seem to know I'm there and start peppering me with everything they have, this game doesnt let you lay prone (on your gut) does it??? Any tips on getting through this would be REALLY APPRECIATED, and THANKS to ALL who replied to an earlier post helping me get through mission 5 (Tank Crew to Safety Mission).
Danke
Fritztoten