However, development of guns and artillery made military revolution that changed the art of war by the beginning of the modern age. Political modernization after religious reform also made important influences to the way of war because states got larger political power to establish modern military forces. The Napoleonic wars was caused by the changes in the way of war. Napoleon Bonaparte, who was one of the most experienced and known generals in military history, made a new idea on how to win wars in the Napoleonic wars. Considering the relations between force, space and time, Napoleon tried to attack the side and back of the enemy forces in battle through strategic movement and tactical surprise. The Napoleonic way of war was to spread out forces by the coming chance of fight, and concentrate forces at the most important time. This made it possible to win wars against the enemy even if his military force was weaker than the enemy force.