About 0230 on Sunday, July 21, units of McDowell’s army began leaving their camps at Centreville. From the start the march was beset with delays. Tyler’s division moved onto the Warrenton Turnpike first, which delayed the movement of the flanking columns of Hunter and Heintzelman. Tyler, stung by his rebuke from McDowell two days earlier, took his time and moved cautiously westward. Traveling with Tyler’s division was a 2 1/2-ton, 30-pounder Parrott rifle. When it arrived at the Cub Run Bridge, there was concern the structure might not hold the gun’s weight. The column halted while engineers reinforced the bridge, causing further delay. | About 0230 on Sunday, July 21, units of McDowell’s army began leaving their camps at Centreville. From the start the march was beset with delays. Tyler’s division moved onto the Warrenton Turnpike first, which delayed the movement of the flanking columns of Hunter and Heintzelman. Tyler, stung by his rebuke from McDowell two days earlier, took his time and moved cautiously westward. Traveling with Tyler’s division was a 2 1/2-ton, 30-pounder Parrott rifle. When it arrived at the Cub Run Bridge, there was concern the structure might not hold the gun’s weight. The column halted while engineers reinforced the bridge, causing further delay. |