...y the concussion, and fell on deck, but soon recovered. Petersburgh, August 1, 1862. A large force of artillery, including many heavy guns, having been placed in position at and below Coggin's Point yesterday, and sighted, opened on McClellan's fleet and camp this morning at one o'clock. The firing continued fiercely for two hours. The enemy's gunboats replied very feebly, doing no damage. At ...