Advance Wars/Units

Infantry
Most basic unit in the game. Weak against everything but other infantry, yet essential to winning the game as only infantry can capture properties.

Mech
I slightly more powerful version of the Infantry unit. Mech units come equipped with bazookas and are able to effectively neutralize light tanks, recon units, artillery, rockets, and APC's, but only if they strike first

Recon
Basic Vehicular unit. Effective against infantry, mech, and other recon units. This unit though lacking in firepower has a large movement range and sight range, making it an essential part of any campaigh, especially in Fog of War situations.

Light Tank
Decent unit. Takes on infantry, artillery, rockets, anti air guns, anti-air missiles, and other tanks with effective results. Weak against Medium tanks, bombers, helicopters, and naval units

Medium Tank
The Medium tank is the most powerful ground unit in the game. It is effective against almost everything. How ever it is still easy to beat if you have Bombers, any indirect fire units like artillery, rockets, and battleships. Helicopters are also somewhat effective because since they are airborne, the medium tank is forced to use its far less powerful machine gun instead of its main cannon. However the helicopter does an equal amount of damage.

Anti Air Vehicle
Takes down all air units with its vulcan cannons. It is probably the most effective unit in neutralizing infantry units.

Artillery
This unit is a long range unit. You do not need to move it right nest to the enemy to fire. The artillery unit has a range of 2-3 spaces and is very effective against all ground unit. It can not fire if an enemy is right next to it so be sure to keep your distance. A good strategy is to pair the artillery up with a 2 light tanks and have the tanks form a wall to keep the enemy from getting too close.

Rockets
This is an upgraded version of the artillery unit. With a range of 3-5 spaces and deadly missiles it can make or break any campaign. This is a must have unit. However, this unit is even more vulnerable to direct attacks and needs to be protected if it is to be useful. Once again use other ground units to protect it.

APC's
APC's are a very useful unit. They can transport one infantry or mech unit. Also they are very essential because they can refuel and resupply ammo to any unit directly next to it. This unit has no weapon and can not attack. But it makes a great temporary defensive unit.