The notion of an early modern military revolution is one which is a much debated subject among historians. Two historians who are very dominant in this field are Geoffrey Parker and Michael Roberts. Although they both agree that a military revolution occurred, they disagree on the timing of a revolution in war. Roberts argues that a military revolution started in 1560 and "by 1660, the modern art of war had come to birth." Parker, on the other hand, sees the military revolution as a "firmly sixteenth century phenomenon with antecedents in the fifteenth."

Prior to the early modern period, warfare was based around castles and fortified towns and attempts to capture them. This changed very little in the middle ages. Armies had a maximum of forty thousand soldiers, many of whom were mercenaries (1550). Armies consisted of Pike men in square formations supported by cavalry and musketeers. Battles often ended in...