The fortress was armed with large Lombard guns that bombarded the city which had pledged to support Isabella .
In August and September 1475 Queen Isabella I of Castille had strengthened garrisons near the city of Burgos while his husband Ferdinand II of Aragon besieged the city 's fortress .
The fortress was armed with large Lombard guns that bombarded the city which had pledged to support Isabella I of Castille .
In August and September 1475 Queen Isabella I of Castille had strengthened garrisons near the city of Burgos while his husband Ferdinand II of Aragon besieged the city 's fortress .