You can pick which one you destroy first. There's a radio tower on a hill, and a second one behind a few buildings. Both of the points are also rather difficult to assault, and you have to destroy both before you get another checkpoint. While neither points have many enemies guarding them, the area in general is infested with bad guys. There are two points you have to plant explosives in. Eventually you'll trigger a cutscene, and then you should get a checkpoint. Once the area is clear, move inside the building and explore. Taking on multiple enemies is not recommended. I doubt other's will be so lucky, but if there are still five guys wandering around, just keep picking one and running away. I ended up getting lucky and once I had only five of them still living, they de-spawned. Again, picking them off one by one was the best approach for me. There are around 10-12 enemies guarding the building. Once the ledge is clear, you can get to work on the rest. If you continue to kill from the same spot, the enemies will typically converge on your position and surround you. Pick them off one by one, running away after each kill. Next, there are three to four enemies that will guard/patrol the ledge on the mountain to the right of the sniper's nest. Now, silenced doesn't mean you're gonna get away with killing everyone, but a sniper is a sniper. If you go around the mountain and come up from the other side of the comms building, you can assassinate the sniper and take his silenced gun. Above the building is a mountain with a sniper's nest. There is still a decent enemy presence though. The first point you'll want to hit is the communication building. I did, and would recommend doing them, in this order. Sucky weapon choices aside, there are three different objectives. It's a short range rifle and this is a wide open area. Why in God's name you spawn with the gun you spawn with I don't have a clue. The second level of Under No Flag is the hardest and the longest without a doubt. Test out some different strategies and find out what's working best for you. You'll find out pretty quickly, especially on the higher difficulties, that the enemies are pretty accurate. I would play through this mission and get a feel for how difficult things are going to be. I don't recall any one thing being obscenely difficult. I do not remember much of the first mission of Under No Flag since I beat it when the game first came out, but from what I do remember, it's a pretty straight-forward mission. This guide should still apply to the lower difficulties anyways. The campaign itself is pretty straight forward on Normal and Hard so I'm going assume that those who are looking for a guide are the ones playing on Hardcore for the achievements.

How to play hardcore battlefield 1