...tley's men, by rolling logs ahead of them and by digging zig-zag trenches, approached so near the enemy's rifle-pits as to be able to throw hand grenades over his breastworks; and on another occasion Sharp 's pickets held their position against a line of battle after those on their right and left had given way. Firing between the parties on the two picket lines was constant during the day, and, not unfr...