Prepare your forces by getting them in an assault position. yell "We're going for a Focused Assault." to get the Armor Class to be at the front.
Assign 2 squad leaders for the mage class, with one division captain/officer to unify them
Have the Scout Class be at the far side of the main group.
Have the forces be ready for the assault. Advance on your signal by saying "Advance!"
The mages will be attacking the left tower, while the scouts will use their arrows to attack the right tower.
Have the mages split into two by yelling "2nd Phase!" This will make the mages separate as well as the Scout Class advancing near the walls to prepare for the ambush. The mages will be bombarding the front gate, while the scouts will sneak towards the entrance of the secret entrance.
Once the gate is cleared, have the main and armor class enter the main gate, while the scouts wait to ambush the retreating enemies.
This is for fortifications that have no archers at the towers, and instead have heavy reinforcements on the front gate.