Goat wroteBloke gets shot, I run through and positively waste every mother (no tanks) then nothing happens. I'll give it another try tonight and see what happens.
Umm... You run through the door where the bloke was shot? You're not supposed to go that way yet. You'll encounter lots of jerries climbing over the wall next to the church, kill them, then someone will tell you there's a tank at the end of the town where you started the mission.
I think it's triggered so that you have to stay in or close to the house you're taking cover in from the mortars, waste the jerries, then the tank appears, run past the jerries to the church, pick up a panzerfaust, head back and take out the tank.
Oh and, a final tip for that level: make sure you're carrying an smg when you get in the car at the end of the level. And don't worry, that's not a spoiler.