[1] The queen's forces harassed King Afonso V of Portugal troops, and managed to cut their supply lines.

[3] By the end of November 1475, King Ferdinand's brother Alfonso of Aragon arrived with skilled siege engineers.

[3][2] King Ferdinand II could not be present when the Burgos garrison surrendered, as he held the siege of Zamora so important that his presence was required there.

Tunnelers had cut off the water supply, and the garrison asked for surrender terms ten days later,[3] on 2 December 1475.

[3][2] However, commander (alcaide) of the garrison Juan de Stúñiga[1] surrendered early on 19 January, and was commended for his valor before his dismissal by Isabella.