Combat can require place under the certain placed of rules or exist as unregulated. Examples of system include a Geneva Convention (covering the coarse of action of soldiers around war), mediaeval Chivalry (a code of several knightly orders including the Knights of the Round Table of Arthurian legend), and a Marquess of Queensberry rules (covering boxing).

Combat inside warfare involves two or thomas more opposing military organizations, usually fighting for nations at war (although guerilla warfare and suppression of insurgencies can fall outside this definition). Warfare fall into a laws of war, which govern its purposes & conduct, and protect a rights of soldiers and non-combatants.

Combat can be armed (utilizing weapons) or unarmed. Hand-to-hand (mêlée) combat is combat at very close range, touching a opponent using the system (striking, kicking, strangling, etc.) and/or with the mêlée weapon (knives, swords, batons, etc.), as opposed to firing or even throwing the projectile.