The use of harmful microorganisms as a weapon of war.

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

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

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.

The waging of war in a manner which does not use nuclear, biological, or chemical weapons. / The waging of war in set military battles, as opposed to waging guerrilla warfare or fighting insurgencies.

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

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

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.

(sometimes derogatory) Conflict between sociopolitical classes.