Warfare (armed conflict) between belligerents who have different strengths and weaknesses.

The use of any harmful organism (such as a bacterium or virus) as a weapon of war.

Combat using groups of irregular, light, mobile troops within areas occupied by an enemy force, usually through hit-and-run tactics.

The use of nuclear weapons as weapons of war.

Warfare in which one or more combatants are irregulars (such as partisans, guerrillas or insurgents) rather than regular military forces.

Synonym of asymmetric warfare

Warfare in which the defender is trapped in a position (such as a fort or castle) while the attacker bombards and/or barricades them from outside.

(uncountable) Warfare in which opposing sides occupy trenches and repeatedly fire at one another; usually involving high casualty rates over a long period of time.