...em to beat a hasty retreat. We kept in hot pursuit all day, passing through the deserted camps of McClellan's hitherto invincible army, and again attacked the enemy about 3 o'clock that evening at Gaines' Mill , or Cold Harbor, driving him before us and assailing him in his strong fortified position on the ridge, with an abattis of felled timber in front to protect him against assault. We carried his work...