This is a small and quick map.

Get your officer to the rendez-vous point and then head as quickly as possible to the base camp in the southeast. Planes will start to attack the convoy on your way. If you are slow, the planes will be devastating. You need to get at least one surviving unit in the camp. You will lose if they all die. There is the possibility to cheat and bring your convoy to the camp before sending your officer to the rendez-vous, but that would be lame... in the end, you do not need them that much.

Meanwhile, you might have noticed that you've lost a few units in the town. The enemy has taken it and once you've arrived in the camp, you need to retake the town. Maybe try to approach it from multiple sides and move your AA guns to the middle in case the planes return.