Follow Maddox forward for a bit till you get to the cliff. Your target is the soldier on top of the tank, then the soldier fixing the back of it. Follow Maddox back down and past the train wreckage. He points out a roving soldier on the top floor of the house ahead, pop him and move into the house with Maddox. When you move out there are three soldiers to hit. The soldier to the left of the house, a soldier on the radio to the right, and the last being on the first floor of the building. Follow your spotter forward and you will see a bunch of guards approaching from either side of the train, duck down and crawl under the train to avoid them. When he tells you to halt, you better stop all that crawling. If your detection meter starts to go off, just ignore it because it won't fill all the way. Keep pressing forward with him till you come to some stairs, stay slow and low behind him so you don't get spotted. Just follow Maddox through the brush and listen to what he calls out so you don't get thrust into a fight. Once you make it past the train yards, you have to eliminate and group of enemies at a train station. Be careful with headshots here, you nail them in the helmet and they will stay alive and raise the alarm, go for chest or face if you can. If you go straight instead of right you can find a secret item on a bench. When Maddox tells you to get down, he will point out a sniper on your right to take out first. Next is a double kill a little lower, do it in the chest to keep it quiet. Finish off the last guy on the left and your good to go to the AA gun bunkers. There is no sneaky way to do this, so you want to line up as many quick kills as you can before you get spotted. Wait till an AA gun rotates enough so you can get a double kill on the gunners, then pick off the officer behind him. The remaining soldier in the front shouldn't give much trouble. When their dead, proceed to the gun and plant some C4 on it. Move towards the next gun and blow the C4 when you're a safe distance away, an explosion from a plane takes care of the second gun when you approach it. To take out the third gun, I crouched behind some sandbags at the second AA gun so I could get my shots off and be far enough away to not get to shot up. Once you blow the AA guns you move down into an underpass. A group of soldiers come from the front and you have to move to a side shack, if you run forward however, you will find a secret item on a table. Once your inside the shack, a dog will spot you guys and you have to run for it, there is no helping it. Wait till the dog just passes the exit and slowly start moving out of it aiming behind you. Once Maddox is spotted, kill a few of the guards and start sprinting the other way, it eases up on the gunfire you take. Run down the hall and take cover on a crate to your right while Maddox sets a charge, enemies will keep spawning so just take your time till he is ready. Once he says "Go, go, go!" run behind you and duck left so the soldiers can move forward and set off the explosion, ending the level.