The most basic ideas in military science can be cut down five words; defense, attack, military mean, military aim and political end. In military science, the all form of the battles can be identified with defense and attack. The defense is to destroy enemy attack waiting on own positions, the attack is to destroy enemy going ahead. The result of the battle depends on the amount military means and military aim. Military mean can be called combat power can be followed from the number and quality of military force. Military aim is the specific target to decide how to use military mean with attack or defense. In military science, political end has the idea of the most reason to fight war against enemy. In short, military science generally researches the cause and effects of military operations between attacker and defender in terms of military means and aim, starting from the political end.