A great many developments and significant events took place during this period, ranging from advances in castle design to the advent of the cavalry charge, the further development of campaign strategies on a grand scale, and the significant changes brought on by the introduction of firearms. The composition of the army changed, with masses of "ashigaru", footsoldiers armed with long lances ("yari"), archers, and, later, gunners serving alongside mounted samurai. Naval battles likewise consisted of little more than using boats to move troops within range of bow or arquebus, and then into hand-to-hand fighting.