Read it through once

These latter braced their energies for a great struggle. Often, white clinched teeth shone from the dusky faces. Many heads surged to and fro, floating upon a pale sea of smoke. Those behind the fence frequently shouted and yelped in taunts and gibelike cries, but the regiment maintained a stressed silence. Perhaps, at this new assault the men recalled the fact that they had been named mud diggers, and it made their situation thrice bitter. They were breathlessly intent upon keeping the ground and thrusting away the rejoicing body of the enemy. They fought swiftly and with a despairing savageness denoted in their expressions.