Definition
"Forces" in legal usage refers primarily to the military and naval power of a sovereign nation — the organized armed strength through which a government conducts warfare and national defense. The term encompasses both the personnel and institutional resources that constitute a country's military capacity.
Two principal uses appear in legal texts:
1. Regular Forces. The formally constituted military establishment — army, navy, and (in modern usage) air and space branches — organized, commissioned, and controlled under national authority. These are the personnel upon whom military duty formally falls in wartime, distinguished from the general citizenry who may theoretically be called upon by a declaration of war but who are not, in practice, treated as combatants unless enlisted or conscripted into the regular establishment.
2. Irregular Forces. Armed groups operating outside the formal military structure — militias, guerrilla units, resistance forces, and similar bodies. Their legal status, particularly under the laws of war, has been a persistent source of doctrinal controversy. Historical legal sources treat irregular forces with considerably less certainty than regular forces, a gap that international humanitarian law has since worked to address.
Common Language
Modern common usage (Wiktionary): Plural of "force." In ordinary English, "forces" may refer to military troops, physical influences acting on an object, or any group acting in concert toward a shared goal.
Historical common usage (Webster's 1913): Military strength; troops; an army or body of troops.
The gap between common and legal meaning here is narrow for the military sense — both ordinary and legal usage converge on organized armed power. The significance for legal research lies in the precision the law imposes: not all armed persons constitute "forces" in the legal sense, and the distinction between regular and irregular forces carries substantial consequences under the laws of war, military law, and constitutional authority over the military.
Recognized Forms
/SUBTYPES
Regular Forces: The standing army and navy (and their modern equivalents) formally constituted by national authority. Combatant status, command responsibility, prisoner-of-war protections, and courts-martial jurisdiction all attach to regular forces.
Irregular Forces: Armed groups without formal national commission. Their legal treatment varies widely across historical sources, domestic law, and international law. Bouvier acknowledges their existence but, consistent with the period, leaves their legal status largely unsettled.
Why It Matters in Research
Researchers working in military law, constitutional war powers, or international law will encounter "forces" as a term of art that has shifted considerably in scope. Historical sources — including both Black's and Bouvier's — reflect a two-branch conception of military power (army and navy) that predates aviation, nuclear command structures, Space Force, and cyber capabilities. Any historical source using "forces" should be read against what military branches actually existed at the time of writing.
The regular/irregular distinction is particularly important in sources predating the Hague Regulations (1907) and the Geneva Conventions (1949). Bouvier's treatment of irregular forces reflects pre-modern international law; researchers should not treat it as a reliable guide to current combatant status rules.
In domestic constitutional research, "forces" appears in discussions of congressional war powers (the power to raise and support armies, to provide and maintain a navy) and presidential commander-in-chief authority. The term does not carry a fixed statutory definition across all contexts — pay close attention to how individual statutes and constitutional provisions delimit the term.
Be alert to false cognates: "reduction in force" (an employment law term of art) and "force majeure" use "force" in entirely different senses. A corpus search on "forces" may surface employment, contracts, and environmental materials alongside military law sources.
Historical Dictionary Support
Black's and Bouvier's agree on the core: forces means the military and naval power of a country. Bouvier adds the practically important gloss that a declaration of war, though theoretically addressed to all citizens, operationally binds only those invested with military character by national authority — a point that matters for understanding the legal boundary between combatant and civilian in historical American law.
Both sources reflect the two-service model of their era. Bouvier's parenthetical noting that aviation forces are "now included" represents a later editorial update, not original text, and signals the kind of accretion common in multi-edition historical dictionaries. Researchers should check edition dates when relying on Bouvier's for historical accuracy.
Neither source engages with irregular forces at any depth, which is historically significant: the legal status of partisans, militia, and resistance fighters was genuinely contested through much of the nineteenth and early twentieth centuries, and the silence of these dictionaries reflects that uncertainty rather than resolving it.
Encyclopedia Cross-Reference
The Law Mind Employment & Labor Law Encyclopedia: Reduction in Force, Layoffs, and the WARN Act — for the employment law use of "force" in "reduction in force," which is analytically distinct from the military sense.
The Law Mind Contracts & Commercial Law Encyclopedia: Discharge — Force Majeure Clauses (Drafting and Enforcement) — for "force majeure," another false cognate that may surface in corpus searches.