Eudes went, not unsuccessfully, to the rescue of his domains; but he was soon recalled to the Pyrenees by the news he received of the movements of Abdel-Rhaman and by the hope he had conceived of finding, in Spain itself and under the sway of the Arabs, an ally against their invasion of his dominions.

The military command of the Spanish frontier of the Pyrenees and of the Mussulman forces there encamped had been intrusted to Othman-ben-Abi-Nessa, a chieftain of renown, but no Arab, either in origin or at heart, although a Mussulman.

He belonged to the race of Berbers, whom the Romans called Moors, a people of the north-west of Africa, conquered and subjugated by the Arabs, but impatient under the yoke.

The greater part of Abi- Nessa's troops were likewise Berbers and devoted to their chiefs.

Abi- Nessa, ambitious and audacious, conceived the project of seizing the government of the Peninsula, or at the least of making himself independent master of the districts he governed; and he entered into negotiations with the Duke of Aquitania to secure his support.