What audio technology was used to direct troops on a battlefield in the revolutionary war?

In terms of the Revolutionary War, the most common flintlock rifle was the Brown Bess muzzle-loading smoothbore musket. It was a British weapon but it was used heavily by both British troops and American colonists alike.

more than 65,000 union soldiers had been killed that summer.

more than 65,000 union soldiers had been killed that summer.

more than 65, is the correct