This was a big mobilisation to deal with a revolt by a mountain people, with no military training nor organisation, and ill-equipped with weaponry. But King Philip was obsessed by his troubles abroad and clearly felt he had to eliminate this problem on his doorstep. An Ottoman fleet was raiding the Spanish coasts and it had captured the Balearic Islands in 1558. In the Spanish Netherlands, the preaching of Calvinist leaders had led to riots in 1566 and to open warfare in 1568: Philip did not want trouble in his own backyard. Moreover, like Catholic leaders everywhere in Europe, he was determined to stamp out "heresy" of all kinds – and the Moors had by now been formally classified as heretics.