three o'clock
_ shouted Orderly-sergeant Mackay . By fours we went to rear and left , then northward at a rapid stride . Some of the men tried to jest , and failed . At three o'clock we were crossing Meadow Bridge ; we could see before us and behind us long lines of infantry -- Lee 's left wing in motion . Beyond the bridge the column filed right ; A.P. Hill came riding back along the line of the Light Division . Suddenly , from over the hills a mile and more away , comes the roar of cannon . We leave the road and march through fields and meadows ; the passing of the troops ahead has cleared the way ; we go through gaps in rail fences .