"While he was vigorously pursuing the Saxon war, almost without a break, and after he had placed garrisons at selected points along the border, [Charles] marched into Spain [in 778] with as large a force as he could mount. His army passed through the Pyrenees and [Charles] received the surrender of all the towns and fortified places he encountered. He was returning [to Francia] with his army safe and intact, but high in the Pyrenees on that return trip he briefly experienced the Basques. That place is so thoroughly covered with thick forest that it is the perfect spot for an ambush. [Charles's] army was forced by the narrow terrain to proceed in a long line and [it was at that spot], high on the mountain, that the Basques set their ambush. [...] The Basques had the advantage in this skirmish because of the lightness of their weapons and the nature of the terrain, whereas the Franks were disadvantaged by the heaviness of their arms and the unevenness of the land. Eggihard, the overseer of the king's table, Anselm, the count of the palace, and Roland, the lord of the Breton March, along with many others died in that skirmish. But this deed could not be avenged at that time, because the enemy had so dispersed after the attack that there was no indication as to where they could be found."