 Soon resistance to the Emperor arose because of heavy taxation to support foreign wars in which Castilians had little interest, and because Charles tended to select Flemings for high offices in Castile and America, ignoring Castilian candidates.The resistance culminated in the Revolt of the Comuneros, which Charles suppressed.Immediately after crushing the Castilian revolt, Charles was confronted again with the hot issue of Navarre when King Henry II attempted to reconquer the kingdom.