Hitherto Biscay had been tranquil, and Navarre so submissive, that the artillery employed against Zaragoza, was conveyed by the country people, without an escort, from Pampeluna to Tudela. But when the battle of Belchite terminated the regular warfare in Aragon, the Guerilla system commenced in those parts; and as the chiefs acquired reputation at the moment when Blake was losing credit by defeats, the dispersed soldiers flocked to their standards; hoping thus to cover past disgrace, and to live with a greater license, because the regular armies suffered under the restraints without enjoying the benefits of discipline, while the irregulars purveyed for themselves. Zaragoza is surrounded by rugged mountains, and every range became the mother of a Guerilla brood; nor were the regular Partizan corps less numerous than the Partidas. On the left of the Ebro, the Catalonian colonels, Baget, Perena, Pedroza, and the chief Theobaldo, brought their Migueletes to the Sierra de Guara, overhanging Huesca and Barbastro. In this position, commanding the sources of the Cinca and operating on both sides of that river, they harassed the communication between Zaragoza and the French outposts; and maintained an intercourse with the governor of Lerida, who directed the movements and supplied the wants of all the bands in Aragon. On the right of the Ebro, troops raised in the district of Molina, were united to the corps of Gayan, and that officer, taking possession of the mountains of Montalvan, the valley of the Xiloca, and the town of Daroca, pushed his advanced guards even to the plain of Zaragoza, and occupied Nuestra Senora del Aguilar. This convent, situated on the top of a high rock, near Cariñena, he made a depôt of provisions and ammunition, and surrounded the building with an entrenched camp for three thousand men. On Gayan’s left, general Villa Campa, a man of talent and energy, established himself at Calatayud, with the regular regiments of Soria and La Princessa, and making fresh levies, rapidly formed a large force, with which he cut the direct line of communication between Zaragoza and Madrid. Beyond Villa Campa’s positions the circle of war was continued by other bands; which, descending from the Moncayo mountains, infested the districts of Taranzona and Borja, and intercepted the communications between Tudela and Zaragoza.