After fortifying the bridge and during the German assault, watch out for the soldier near the back of the bridge. He’ll get shot later on (when your team starts to fall back a bit) and you’ll be able to safely drag him to cover without too much trouble.
After regrouping with Turner and reaching a bunker with a sniper, one of your allies will get picked off in the open. Don’t rush to his aid without deploying a smokescreen beside your wounded ally. Once the smoke has fully deployed, quickly grab and pull him to the safe spot near the bunker’s door.
Once you’ve reached the lumber mill where your surviving allies are engaging the german positions there, head to the mill on the left. It will help if you’ll deploy a smoke screen inside. Take out the two immediate enemies near the entrance then quickly take out the enemy soldier strangling your ally downstairs to the left. Another enemy will take cover on the ledge in front of you so prepare to kill him quickly as well.