As Charlemagne marched north back to France he again passed through Basque territory. His large army was deep in the Pyrenees in a long column on August 15, 778. His rearguard was commanded by Roland, one of Charlemagne's most trusted leaders. The rearguard was attacked starting the Battle of Roncevaux Pass. The Basques using their knowledge of the terrain were able to overcome the Frankish rearguard. But their job was to protect the main army so they fought to the last man. The Basques plundered the baggage trains and captured the gold Charlemagne was paid at Zaragoza. Before the Frankish army could turn to fight the Basques, they had gone. Roland and his men died as heroes.