 The castle of Burgos and the cities of Plasencia and Arévalo were controlled by the Estúñiga family, supporters of Joanna.The city of Burgos, controlled by the Fernandez de Velasco family, backed Isabella.Afonso found fewer supporters in Castile than he expected and changed his plans, preferring to instead consolidate his control in the area closest to Portugal, in particular Toro, a city that received him favourably even though the garrison of the castle proclaimed itself loyal to Isabella.