(idiomatic) A mentally manipulative approach to warfare involving use of techniques to demoralize or intimidate someone into surrender.

The use and management of information in pursuit of an advantage over an opponent, such as propaganda, disinformation, and gathering assurances that one's own information is accurate.

(neologism) Warfare that blends conventional warfare and irregular warfare (potentially including cyberwarfare and information warfare) — the full spectrum of conflict.

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

The use of harmful microorganisms 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.

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

(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.

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.

(sometimes derogatory) Conflict between sociopolitical classes.