The Battle of Kasserine Pass was a series of battles of the Tunisia Campaign of World War II that took place in February 1943 at Kasserine Pass, a 2-mile-wide (3.2 km) gap in the Grand Dorsal chain of the Atlas Mountains in west central Tunisia. After the early defeat, elements of the U.S. II Corps, with British reinforcements, rallied and held the exits through mountain passes in western Tunisia, defeating the Axis offensive. As a result of the battle, the U.S. Army instituted sweeping changes of unit organization and replaced commanders and some types of equipment.