No shot fired walkthrough of the Fidel quest.
Take the ID you got at the convoy ambush. And a weapon for show.
You can go solo on this. Leave behind Larry or anyone if he does not have an Allied uniform on.
Walk into the house outside the prison. Confront the officer there. You should be wearing a British Caommando Officer uniform to go with the Andrew Lindsey ID you picked up. Take the dialoge path where you produce the fake ID , and bluff your way through. You will wind up with Fidel meeting you back at the old man in the forrest's cabin and a bundle of exp.
Note you should not have had the ID forged for you. You only get to do the forging once so do it when you got all four blank ID's from the mysterious man.