in 1000, Basil was free to focus on a war of conquest against Bulgaria, which he fought with grinding persistence and strategic insight. In 1000, the Byzantine generals Nikephoros Xiphias and Theodorokanos took the former Bulgarian capital Great Preslav, and the towns Lesser Preslav and Pliskova. In 1001, Basil, operating from Thessalonica, regained control of Vodena, Verrhoia and Servia. The following year, he based his army in Philippopolis and occupied the length of the military road from the western Haemus Mountains to the Danube, cutting off communications between Samuel's Macedonian heartland and Paristrion (the lands south of the lower Danube). Following this success, Basil laid siege to Vidin, which fell after a prolonged resistance. Samuel reacted to the Byzantine campaign by launching a large-scale raid into the heart of Byzantine Thrace and took the major city of Adrianople by surprise. After turning homeward with his extensive plunder, Samuel was intercepted near Skopje by a Byzantine army commanded by Basil, whose forces stormed the Bulgarian camp, defeating the Bulgarians and recovering the plunder from Adrianople. Skopje surrendered shortly after the battle, and Basil treated its governor Romanos with overt kindness. In 1005, the governor of Dyrrhachium Ashot Taronites surrendered his city to the Byzantines. The defection of Dyrrhachium completed the isolation of Samuel's core territories in the highlands of western Macedonia. Samuel was forced into an almost entirely defensive stance; he extensively fortified the passes and routes from the coastlines and valleys held by the Byzantines to the territory remaining in his possession. During the next few years, the Byzantine offensive slowed and no significant gains were made, although an attempt by the Bulgarians to counter-attack in 1009 was defeated at the Battle of Kreta, to the east of Thessalonica. In 1014, Basil was ready to launch a campaign aimed at destroying Bulgarian resistance. On 29 July 1014, in the Battle of Kleidion, he and his general Nikephoros Xiphias outmaneuvered the Bulgarian army, which was defending one of the fortified passes. Samuel avoided capture through the valor of his son Gabriel. Having crushed the Bulgarians, Basil exacted his vengeance cruelly—he was said to have captured 15,000 prisoners and fully blinded 99 of every 100 men, leaving one one-eyed man in each cohort to lead the rest back to their ruler. A possible reason for this vengeance was that, in Byzantine eyes, the Bulgarians were rebels against their authority, and blinding was