Take with 4 men 2 Machinegun-placements, and take 2 men and grab the Mortar,(all from the level before this 1) fill them all up with ammo, as much you can find.Then when the level ends, you begin the train-level, with those things, it is stil hard, but now when you go around, you can clear the trench, before the new soldiers come.I am still in this level, I can clear all the Krauts, but I think I cant destroy the train, not enough time.