Company (military unit) in the context of "Compagnie des Carabiniers du Prince"

The army rank of captain (from the French: capitaine) is a commissioned officer rank historically corresponding to the command of a company of soldiers. The rank is also used by some air forces and marine forces, but usually refers to a more senior officer.

The Royal Marines provide the United Kingdom's amphibious special operations capable commando force, one of the five fighting arms of the Royal Navy, a company strength sub-unit to the Special Forces Support Group (SFSG), landing craft crews, and the Naval Service's military bands. The Royal Marines trace their origins back to the formation of the "Duke of York and Albany's maritime regiment of Foot" on 28 October 1664, and the first Royal Marines Commando unit was formed at Deal in Kent on 14 February 1942 and designated "The Royal Marine Commando".

The Royal Marines have seen action across many conflicts but do not have battle honours as such, but rather the "Great Globe itself" was chosen in 1827 by King George IV in their place to recognise the Marines' service and successes in multiple engagements in every quarter of the world. Today it consists of the United Kingdom Commando Force, the Royal Marines Band Service, the Commando Training Centre and four Reserve Units.

A military engagement is combat between two forces, neither larger than a division nor smaller than a company, in which each has an assigned or perceived mission. An engagement begins when the attacking force initiates combat in pursuit of its mission, and ends when the attacker has accomplished the mission, or ceases to try to accomplish the mission, or when one or both sides receive sufficient reinforcements, thus initiating a new engagement.

As a tactical mission, the engagement is often a part of a battle. An engagement normally lasts one to two days; it may be as brief as a few hours and is rarely longer than five days. It is at this scale of combat that tactical engagement ranges of weapons and support systems become important to the troops and their commanders.

Freikorps (German: [ˈfʁaɪˌkoːɐ̯], "Free Corps" or "Volunteer Corps") were irregular German and other European paramilitary volunteer units that existed from the 18th to the early 20th centuries. They effectively served as mercenaries or private military companies, regardless of their own nationality. In German-speaking countries, the first so-called Freikorps ("free regiments", Freie Regimenter) were formed in the 18th century from native volunteers, enemy renegades, and deserters. These sometimes exotically equipped units served as infantry and cavalry (or, more rarely, as artillery); sometimes in just company strength and sometimes in formations of up to several thousand strong. There were also various mixed formations or legions. The Prussian von Kleist Freikorps included infantry, jäger, dragoons and hussars. The French Volontaires de Saxe combined uhlans and dragoons.

In the aftermath of World War I and during the German Revolution of 1918–19, Freikorps, consisting partially of World War I veterans, were raised as paramilitary militias. They were ostensibly mustered to fight on behalf of the government against the German communists attempting to overthrow the Weimar Republic. However, many Freikorps also largely despised the Republic and were involved in assassinations of its supporters, later aiding the Nazis in their rise to power.

A penal military unit, also known as a penal formation, disciplinary unit, or just penal unit (usually named for their formation and size, such as penal battalion for battalions, penal regiment for regiments, penal company for companies, etc.), is a military formation consisting of convicts mobilized for military service. Such formations may consist of military prisoners convicted under military law, civilian prisoners convicted in civilian courts, prisoners of war who have chosen to side with their captors, or a combination of these groups.

Service in penal military units is generally considered a form of punishment, discipline, or penal labour, used in lieu of, or offered as an alternative to, imprisonment or capital punishment. Penal units have historically been used as disposable cannon fodder, treated poorly or with little regard and used in compromising or dangerous situations (commonly suicide missions such as demining or forlorn hope advance parties), as march battalions that maintain replacement personnel as reserves, or kept in the rear for military operations other than war or menial labour relating to the war effort, guarded and overseen by regular military units, military police, or barrier troops to ensure they do not attempt to escape, retreat, or mutiny. However, this is not always the case: some penal units are treated the same as regular units and, depending on military organization, a dedicated penal unit may not exist at all, with convicts instead being placed in a regular unit. Rewards and incentives for convicts to serve in a penal unit vary—often expungement, commutation, stay of execution, or a pardon—though penal units used as punishment typically lack those by nature.

While modern standing armies were first developed in the 15th century, the defining terminology for contemporary military units and formations, such as company, battalion, regiment etc. mostly arose in the early modern period, during the 16th and 17th centuries.

Only units that are still extant are included, while contemporary refounding of older units are excluded.

A regiment is a military unit. Its role and size varies markedly, depending on the country, service, or specialisation.

In Medieval Europe, the term "regiment" denoted any large body of front-line soldiers, recruited or conscripted in one geographical area, by a leader who was often also the feudal lord in capite of the soldiers. Lesser barons of knightly rank could be expected to muster or hire a company or battalion from their manorial estate.

A battalion is a military unit, typically consisting of up to one thousand soldiers. A battalion is commanded by a lieutenant colonel and subdivided into several companies, each typically commanded by a major or a captain. The typical battalion is built from three operational companies, one weapons company and one headquarters company. In some countries, battalions are exclusively infantry, while in others battalions are unit-level organizations. The word battalion has its origins in the Late Latin word battalion, which is derived from battalia, meaning "battle" or "combat." The term was used to describe a large group of soldiers ready for battle. Over time, its meaning evolved in military terminology.

The word "battalion" came into the English language in the 16th century from the French bataillon, meaning "battle squadron" (similar to the Italian battaglione meaning the same thing) and the Spanish batallón, derived from the Vulgar Latin noun battalia ("battle") and ultimately from the Classical Latin verb battuere ("to beat" or "to strike"). The first use of the word in English is attested in the 1580s.