horn

For example, after perform the attack command it will make an hornsound to show the enemy that we are attacking!

Hi, It would add a huge impact in the ambiance of a battle when troops would clash their weapons against their shilds while walking to the enemy. When ordering to charge, That they would make a warscream and/or a horn being blown. Some troops with instruments raising the morale of the troops...

but to prevent overusing it; only at army vs army battles and only for ordering all formations at once. You can consider to use different sounds for different orders and cultures, even cheer sounds for charge command for intensity.