The explosion immediately killed 278 Confederate soldiers of the 18th and 22nd South Carolina[9] and the stunned Confederate troops did not direct any significant musket or artillery fire at the enemy for at least 15 minutes.[10] However, Ledlie's untrained division was not prepared for the explosion, and reports indicate they waited 10 minutes before leaving their own entrenchments. Footbridges were supposed to have been placed to allow them to cross their own trenches quickly.