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In page Samuel of Bulgaria:

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Basil II decided to return to Constantinople afterwards, but, fearing an encounter with the Bulgarian army on the main road to his capital, he used an alternate route.[citation needed] The Byzantines marched south through the Morava valley and reached a key Bulgarian city, Skopje, in 1004. The Bulgarian army was camping on the opposite side of the Vardar River. After finding a ford and crossing the river, Basil II attacked and defeated Samuel's unsuspecting army, using the same tactics employed at Spercheios.[5] The Byzantines continued east and besieged the fortress of Pernik. Its governor, Krakra, was not seduced by Basil's promises of a noble title and wealth, and successfully defended the fortress. The Byzantines withdrew to Thrace after suffering heavy losses.[1][6]