but then collapsing floors below and above boom and timbers snap , boom like artillery , snap like rifles and suddenly louis is back then and there in valor as , shirtless against the heat , they break out of the jungle into the meadow and dig in against the bullets and shells from the booming snapping entrenched heights until finally the gatlings speak up and hold down the spanish fire and the bugle sounds and they rise to their feet like a single man , shouting and charge .