Advance Wars 2: Black Hole Rising/Border Skirmish

You start off with one infantry, one mech, one tank, one artillery unit and an APC. The enemy have 3 tanks, 2 infantry units and 1 APC.

Day 1
Move the mech into the wood and get it to attack the tank, have the tank move to the east of the tank and attack it. Move your infantry three squares east and have it capture the property, have the artillery go to the far east and have the APC refill the Mech's ammo (have the APC south of the mech).

Day 2
Capture the property, have the mech go into the APC and have the APC go in-between the two cities and place it on the northern city, move the artillery north 1 square and east 1 square. Move the tank 1 square west of the mech

Day 3
Have the artillery attack the westernmost tank, use the mech to finish it off, now have the tank attack the other tank, load the infantry into the APC and have it advance to the HQ, drop it off on the nearest square to the HQ (on the wood). If the enemy tank's health is on 6 then the game will take 1 more turn to complete.

Day 4
Have the artillery attack the northern infantry, then have the mech move up, onto the river and kill the infantry, have the infantry capture the HQ and have the tank move onto the square where the infantry as and attack the tank. Move the APC away onto the bridge.

Day 5
Have your mech attack the infantry and have the artillery move to the southern property. Have your infantry continue capturing the property and you should win if it is on 7 health, if it is on 6 then kill the tank with your tank.

Day 6
Continue capturing the property and you will win.