After being yelled at by their lieutenant, Henry and Wilson told him that their regiment will what?

D) charge

"We're goin' t' charge--we're goin' t' charge!"

The enemy is going to make a charge so the general wants to charge to so I'd pick D.

"The general, whom the boys knew as the commander of their division, looked at the other officer and spoke coolly, as if he were criticising his clothes. "Th' enemy's formin' over there for another charge," he said. "It'll be directed against Whiterside, an' I fear they'll break through unless we work like thunder t' stop them."