At 2 p.m., Jubal Early decided to attack Barlow with Henry Heth's division. Barlow's men were soon in a difficult position as Confederate artillery lobbed in shells that set the surrounding woods on fire. They were able to retreat through a mile-long corridor and crossed the Po without being captured, destroying the bridges behind them. Grant's tactics were criticized for this so-called "Battle of the Po." Since he had ordered Hancock to move late in the day on May 9, he allowed Robert E. Lee time to react and nullify the movement on May 10.