07 - Relentless
Press the button to exit the tank when told. Run up and take cover behind the burned tank on the right and feel free to swap for that Tommy gun. Just make a path and run to the left side of the creek and use either gun as you advance up this path. On Vet it just takes normal, half-luck patience to get up, and just remember to use whatever cover you have. I suggest using the Tommy to start and then using the Browning at the bigger fight. With the enemy position in sight, toss a smoke to the side, a hidden enemy should pop up, and hiding behind the rock should trigger the checkpoint.
*NOTE: It's applied for most of the game, but tossing a frag to the enemies and then moving up is a good idea, nevermind there are tons of frags on the bodies all over to refill.*
From here just use the big gun to pop heads and return frags as you see. After a big explosion at the back, possibly something you want to cause with a frag, another checkpoint should hit soon after. Move up to the sandbags and from here just stay cool and pop a few enemies, but mostly throw a few frags to the left by the bunker. When Roebuck yells that means a wave will emerge. I say toss a frag to the bunker, shoot a spray of bullets as you move left, and hide behind the Triple 25, don't get on it.
The checkpoint should hit, so now just clear this area up and advance. You can stand behind some crates over the trench as you clear the enemies near the next gun, but at some point you want to toss smoke toward the gun and move down there. Soon after you want to move to the left, where there is a flat piece of ground, and from this cover a checkpoint should trigger soon. Move up to the enemy position on this left side, and if you can jump into this defensive point there is a little alcove on the left behind the boxes that works as a most excellent frag shield.
*NOTE: Reloading the Browning is long, so even though it can go almost forever without reloading it would suck to have to do it in battle, so pick your spots to refresh it.*
From this defensive position pop any enemies to the right around the pond, then the ones near you, and don't be surprised if there are enemies like standing in the open nearby. When things seem calm on your side take second look around the water for enemies. One thing that is weird is how it seems like you can't hit the enemies on the right side, odd. Just move up the left to trigger an attack, then fall back and defend and then pick off the new enemies up to the left. Move up for the final checkpoint and watch for a few loners on the right as you move up the path.
Hop over the fallen tree and this triggers the enemies and explosion up ahead. Stay low, be patient, and move up to the trench. Go left and pick up the BAR. Here just stay down and clear the guys to the left. When the flame tank appears you should go left and then follow it up the hill, but not directly behind it. You could possibly stay behind cover and let it run its course, or move along cover close behind it. There will be enemies popping up all over, even in spots the tank clears. You mainly want to keep your eye to the left cave entrance at the top, that will have the most enemies. But again, it's best to follow, and for some reason following the tank and just juggling between the left and right side of it worked better than on normal difficulty.
When you reach the top, or the tank stops, be careful of the red barrels nearby that may still stand. Just toss your last smoke to the left entrance of the cave; either side leads to the same, but the tank stops closer to the left. Toss a few frags and move up the entrance to trigger the checkpoint.
Few enemies in the start of the tunnel, then make your way up to the first room. From this left side you need to be careful of hard-to-hit enemies to the left. I suggest you toss two frags to the left, then two into the heart of the room for the clog of enemies in there. When you can move up, move along the wooden barrier and notice that you can crouch and shoot through the opening in the barrier. You can clear the tunnels on the left and up from this room, but you want to take the path up the right, killing a few enemies.
This right path has a ton more enemies in here, but they should be not too hard to kill. The reason you took the more difficult path is because when you reach the artillery room there is not much fire from this side.
*DEATH CARD 7: If you take either path, it's after the first room, in the mid-way point of the tunnel, before the final room, and in a tiny section that connects the two paths.*
Just take your time, toss your frags all over, stay behind cover, and it's probably the gunner on the left that will be killed last. It should actually not be too hard, even to clear on vet.