They'll manage it somehow.

Look, Harry, see the flames bursting from the timbers now.

Gallop, men! Gallop! We may get our faces scorched in crossing the bridge, but when we're on the other side it won't be there for the Yankees!" The Invincibles and the other infantry regiments all were advancing at the double quick, with the cavalry closing up the rear.

Behind them many bugles rang and through the dense rain they saw the Northern cavalry leaders swinging their sabers and cheering on their men, and they also saw behind them the heavy masses of infantry coming up.
Harry knew that it was touch-and-go.

The bulk of the army was across, and if necessary they must sacrifice Ashby's cavalry, but that sacrifice would be too great.