Once you have a regiment under your command, you need to give it some orders. Five basic orders appear on the command bar:

Move, Attack, Run, Stop and Guard

Click on Move [M] and then on an open space in on battlefield screen to instruct your regiment to move to that location. You can also right-click on your destination to have the selected regiment move there. Hold right click down on a location and rotate mouse to select the direction the regiment will face (toward the enemy!).

Move

Click on Attack [A] and then on an enemy unit or structure to instruct your regiment to attack that enemy, and chase them if they run. Like using the Move command, right-clicking on an enemy will also issue an Attack order.

Attack

Run [R] is a variation of the Move order. It puts your regiment temporarily into Column formation, allowing it to move quickly while avoiding the enemy rather than attacking.When the regiment reaches its destination, it returns to its previous formation. You can also hold down the [Alt] key and right-click to automatically issue a run command

retreat

Stop [S] tells a regiment to stop what it’s doing.

Stop

Guard [G] tells a regiment to stay close to a unit or location, attacking any enemies that come near.

Guard





Source: Axis and Allies RTS Official Manual