The Siege of Budapest was one of the bloodiest sieges of World War II. Emphasis shifted to naval battles and strategies of attrition such as blockades and sieges. Archers were also used in sieges and sea battles. The new fortresses ensured that war rarely extended beyond a series of sieges. More traditional sieges of fortifications took place in addition to trench sieges. In a war composed mostly of sieges rather than battles, Farnese proved his mettle. In a war composed mostly of sieges rather than battles, he proved his mettle. The first decade of his rule was one of long sieges, conquests, rebellions and victories. Halland was the object of numerous battles, sieges and occupations by Swedish troops. At various locations described by Vitruvius, battles and sieges occurred. Medieval and early modern rockets were used militarily as incendiary weapons in sieges. Both were skilled in conducting sieges and defences themselves. Medieval campaigns were generally designed around a succession of sieges. There was increased emphasis on navies, sieges, mercenaries and economic warfare. Cannon capable of breaching fortified walls and ending sieges was the principal weapon.