Muley Abul Hassan sallied out of Malaga with fifteen hundred horse and six thousand foot, and took the way by the sea-coast, marching through Estiponia, and entering the Christian country between Gibraltar and Castellar. The only person that was likely to molest him on this route was one Pedro de Vargas, a shrewd, hardy, and vigilant soldier, alcayde of Gibraltar, and who lay ensconced in his old warrior rock as in a citadel. Muley Abul Hassan knew the watchful and daring character of the man, but had ascertained that his garrison was too small to enable him to make a sally, or at least to ensure him any success. Still, he pursued his march with great silence and caution; sent parties in advance to explore every pass where a foe might lie in ambush; cast many an anxious eye toward the old rock of Gibraltar as its cloud-capped summit was seen towering in the distance on his left; nor did he feel entirely at ease until he had passed through the broken and mountainous country of Castellar and descended into the plains. Here he encamped on the banks of the Celemin, and sent four hundred corredors, or fleet horsemen, armed with lances, to station themselves near Algeziras and keep a strict watch across the bay upon the opposite fortress of Gibraltar. If the alcayde attempted to sally forth, they were to waylay and attack him, being almost four times his supposed force, and were to send swift tidings to the camp. In the mean time two hundred corredors were sent to scour that vast plain called the Campina de Tarifa, abounding with flocks and herds, and two hundred more were to ravage the lands about Medina Sidonia. Muley Abul Hassan remained with the main body of the army as a rallying-point on the banks of the Celemin. The foraging parties scoured the country to such effect that they came driving vast flocks and herds before them, enough to supply the place of all that had been swept from the Vega of Granada. The troops which had kept watch upon the rock of Gibraltar returned with word that they had not seen a Christian helmet stirring. The old king congratulated himself upon the secrecy and promptness with which he had conducted his foray, and upon having baffled the vigilance of Pedro de Vargas.