| Into the Heartland
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If you don't mind a minor cheat, immediately restart the level.  You'll lose
any first aid kits you had left over from the previous mission, but you'll have
a BAR and full ammo, which is very useful in this level.

Anyway, run forward to the next dirt pile and start shooting.  Once the Germans
start retreating, follow, heading to the extreme left side of the bridge.  Once
done, get on the other side of the girders and duck to avoid the fire from your
tanks.  The enemies will be running all over by now, so creep forward, stopping
to shoot anyone you see.  Also be on the lookout for a G43, as it works great
here.  Proceed forward until you come to an overturned truck.  To the right of
it are two fallen girders, between which is some ammo and a first aid kit.

Proceed forward to the last girder and you'll see a whole lot of Germans
running around in the distance.  Snipe them when they stop, attempting to clear
as many of them as possible before running back to the side of the bridge.  
Continue forward until you see another overturned truck.  Near it is a first
aid kit and some much-needed G43 ammo.

Another large group of Germans will appear in the distance.  Deal with them
however you can, then move forward to a third truck, this one with two first
aid kits.  You'll now be under fire from six (!) machine guns, two in pillboxes
on either side of the bridge and four in the center, all of which can sniped.
The ones in the center have lots of infantry guarding them, however, so they
won't stay clear for long.  This doesn't apply to the side nests.

Once done (and it can take a while), head forward, grabbing another first aid
kit.  There's another nest to take care of, but we can't hit it from here.  
Enter the northern tower.  There are two more first aid kits and some BAR ammo
up the staircase to your right when you enter, plus another first aid kit and a
lot more ammo in the pillbox to the north.  Head downstairs when you're set.

At the bottom, poke your head around the corner then back up.  Wait for a 
couple of guys to rush you, then start picking off the guys on the west side of
the room.  There are some on the ground that you should be able to hit as well.
Once clear, some allied soldiers will run in (thanks a lot guys...).  There's
a first aid kit behind the staircase you took to reach the floor and two more
in a cupboard at the south side of the room.  By the way, you can always
retrace your steps here should you need more health.  

Head up the other staircase in the room and face more Germans.  Proceed down
the hallway and into the next room.  Stick to the left wall to find a staircase
leading down.  Several Germans will attempt to run up, but are easy pickings
since it's so steep.  After they stop coming, focus on anyone else on the 
ground and the grenadiers on the south balcony.  There's a first aid kit on the
ground to the northwest.  Head up the other staircase and follow the path up.

At the top is another curving staircase.  Stay at the bottom and kill anyone
that charges you.  There should be five or so.  Continue up to find another
spiral staircase.  Again, four or five guys will charge you.  Continue past the
office and up another spiral staircase.  No one comes down this one.  At the
top is a ladder leading up to the final machine gun nest (plus an AA gun), as
well as the four guys guarding it.  Just climbing up is a bad idea, as there's
no cover and you'll end up facing away from three of them.  Probably the safest
method is to climb almost all of the way up the ladder, then climb back down
and kill anyone that follows.  You'll probably only lure away one or two, but
it's enough.  Climb up and kill whomever's left, then man the AA gun and start
downing Stukas.  Once enough are destroyed, you'll finish the mission.