Activate your tactical view. Check the first screen (#1), because that's where you'll have to go (south and then east). You shouldn't encounter any additional enemy units here. Order your team members to hide behind a small brick wall. Look at the second screen if you're having problems finding it (#2). Don't worry about your teammates, because they'll also be protected by a nearby building.
As for your main character, I would recommend running towards an opposite building (#1). It shouldn't be too hard. Once you're there, hide behind the left wall. Lean out carefully. I would recommend that you kill one of the snipers. He will be standing to your right (#2). This is very important, because he wouldn't have any problems killing you.
Once you've killed the sniper, try moving closer to one of the brick walls (#1). Obviously you must be crouching here, so you won't expose yourself too much to enemy fire. Start shooting at the visible enemy soldiers (#2). Most of them will appear in front of you. Also, your team members will assist you during these fights.
You could also order your squad member to move to the left. You would find a smaller brick wall here (#1). This would allow to surprise all of the remaining rebel soldiers (#2). Don't enter the square area just yet. Instead, wait for some new objectives to be displayed on your screen.
1a) Clear out Anti-Air defenses around the square (Obviously you won't find this objective on the official list, because the commanding officers didn't suspect that there may be AA tanks in the area.)
There are three Anti-Aircraft tanks near the square. I guess you will be pleased to hear that you will be allowed to take them out in any order. I will do my best to show you the easiest and the most efficient route. We'll start off by going towards a tank which is located to the west (#1). It's also to the north of the big arena. You could take the rest of the team with you, however this won't be necessary and you would only endanger lives of your men. You will have to be very stealthy here. The tank is being guarded by a heavy machine gun post (#2). Kill this soldier.
You may proceed to an unguarded tank (#1). I guess you should by now what should be done here. You will have to approach the artillery piece. Press and hold the X key in order to place a charge on the tank. Once this is done, move back and press the detonation key (#2).
Now we'll have to proceed to the second tank. It's located closest to your main goal. It's to the south of the journalist location. As a result, you must go back to the arena (#1). I'd strongly recommend that you stay close to the buildings visible on your right, because it's going to be very easy to die here. You should notice some rubble here. Start moving forward (#2).
You will have to be very stealthy here, so you aren't noticed by anyone. Make a few steps forward. You should be able to notice a few soldiers (#1). Kill them. Once they're gone, wait for their colleagues to show up (#2). Order your men to get here.