additional union troops had arrived by this time. the 2nd division of the v corps, under brig. gen. romeyn b. ayres, was known as the "regular division" because two of its three brigades were composed entirely of u.s. army (regular army) troops, not state volunteers. (the brigade of volunteers, under brig. gen. stephen h. weed, was already engaged on little round top, so only the regular army brigades arrived at the wheatfield.) in their advance across the valley of death they had come under heavy fire from confederate sharpshooters in devil's den. as the regulars advanced, the confederates swarmed over stony hill and through rose woods, flanking the newly arrived brigades. the regulars retreated back to the relative safety of little round top in good order, despite taking heavy casualties and pursuing confederates. the two regular brigades suffered 829 casualties out of 2,613 engaged.