As soon as you join your French Resistance allies in crossing the bridge and assaulting the German position in the building across it, watch out for a resistance fighter on the left side of the bridge that will get sniped and wounded. If you’re drawing too much fire, use a smoke grenade. Otherwise, simply pull him behind a nearby crate to complete the heroic action.
After regrouping with Crowley, you’ll be asked to clear out the building. Head to the second floor and take out the germans shooting at you. Watch out for the surrendering enemies behind the desks to complete this heroic action.