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The portal doesn't put you in the right place though. You need to go through another camp. Thankfully, you have a little help. Advance into the barn and wait a second for the agents to come through and launch the attack. Advance to the end of the barn and engage the Germans.
There's about 20 or so in the yard. They're pretty easy to spot though and there's a lot of cover. The only real danger is that a few of them are on the other side of the train. They can fire under the train by crouching though, so it's easy to accidentally walk into an ambush. The other important thing is to keep an eye on the agents. At least one of them should bit the dust. If that happens, grab his assault rifle to make this whole thing a lot easier. Other than that, just push forward with the machine gun and clear a path over to the crates and damaged truck. Jump up and go through the door to get a quick cutscene.
Stopping the group from getting to the radio tower isn't a challenge. Sprint after them to get within range, then start spraying into them with the machine gun. You should be able to kill them before they even round the curve on the slope. Just watch out for the few guards hiding behind the rocks. When this group is dead, run down to the truck and hop in for a bit of a bumpy ride.
There isn't much to do for this truck ride. The only tricky part is just ahead as you pass by the bridge. You'll have to take out the snipers on the bridge to protect yourself. Other than that, you're basically home free. Just stay crouched and fire at the soldiers walking along the road. You should survive just fine by sheer luck alone.
Once you make it to the end, you'll just have to get to the marker. Move forward and get up to the marker. Crouch and gun down the 3 men facing away from you. Then deploy the flare quickly. Kill any remaining guards in your way, then rush over to the open portal by the truck.
You should also receive about 9 points for this one, since it was technically 3 missions. Spend them well.