 A plaque commemorating the U.S. Army Signal Corps' contribution to the battle is mounted today on a boulder near the peak of Little Round Top.On July 3, before Pickett's Charge, artillery fire against the Union line was so intense that the signalmen could not use their flags.Captain Edward C. Pierce, a signal officer attached to the VI Corps, acted as a mounted courier to Maj. Gen. George G. Meade's headquarters, despite warnings that he would never make it alive through the firing.