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A brigade is a major tactical military formation that is typically composed of three to six battalions, plus supporting elements depending on the era and nationality of a given army and could be perceived as an enlarged/reinforced regiment. Usually, a brigade is a sub-component of a division, a larger unit consisting of two or more brigades.
Brigades formed into divisions are usually infantry or armoured (sometimes referred to as combined arms brigades), in addition to combat units they may include combat support units or sub-units such as artillery and engineers, and logistic units or sub-units. Historically such brigades have sometimes been called brigade-groups. On operations a brigade may comprise both organic elements and attached elements, including some temporarily attached for a specific task.
Brigades may also be specialized and comprise battalions of a single branch, for example cavalry, mechanized, armored, artillery, air defence, aviation, engineers, signals or logistic. Some brigades are classified as independent or separate and operate independently from the traditional division structure. The typical NATO standard brigade consists of approximately 3,200 to 5,500 troops. However, in Switzerland and Austria, the numbers could go as high as 11,000 troops. The Soviet Union, its forerunners and successors, mostly use "regiment" instead of brigade, and this was common (e.g. Germany) in much of Europe until after World War II.
A brigade's commander is commonly a brigadier general, brigadier or colonel. In some armies the commander is rated as a General Officer. The brigade commander has a self-contained headquarters and staff. The principal staff officer, usually a lieutenant colonel or colonel, may be designated chief of staff, although until the late 20th Century British and similar armies called the position 'brigade-major'. Some brigades may also have a deputy commander. The headquarters has a nucleus of staff officers and support (clerks, assistants and drivers) that can vary in size depending on the type of brigade. On operations additional specialist elements may be attached. The headquarters will usually have its own communications unit.
The brigade was invented as a tactical unit by the Swedish king Gustavus Adolphus. It was introduced during the Thirty Years' War to overcome the lack of coordination between normal army structure consisting of regiments by appointing a senior officer. The term derives from Italian brigata, as used for example in the introduction to The Decameron where it refers only to a group of ten, or Old French brigare, meaning "company" of an undefined size, which in turn derives from a Celtic root briga, which means "strife".
The so-called "brigada" was a well mixed unit, comprising infantry, cavalry and normally also artillery, designated for a special task. The size of such "brigada" was a reinforced "company" of up to two regiments. The "brigada" was the ancient form of the modern "task force".
This was copied in France by General Turenne, who made it a permanent standing unit, requiring the creation in 1667 of a permanent rank of brigadier des armées du roi (literally translating to brigadier of the armies of the king) which would in time be renamed simply Général de brigade (but would still be referred to occasionally as brigadier for short).
Individual armies 
In the Australian Army, the brigade has always been the smallest tactical formation, since regiments are either administrative groupings of battalions (in the infantry) or battalion-sized units (in the cavalry). A typical brigade may consist of approximately 5,500 personnel between two mechanised infantry battalions, an armored regiment, an armored artillery regiment, and other logistic and engineering units. The brigade is usually commanded by an officer holding the rank of Brigadier, who is referred to as the "Brigade Commander".
United Kingdom 
Brigades, with a field not a regional administrative role, have usually been of a named type and numbered since the 19th century (e.g. Cavalry Brigade or Infantry Brigade). From after World War II brigade numbers have been unique and not by type. Brigades in divisions do not usually command their combat support and combat service support units. These remain under divisional command, although they may be permanently affiliated with a particular brigade (as a "brigade group"). Historically infantry or cavalry/armoured brigades have usually been three or four combat arm battalions, but currently larger brigades are normal, made larger still when their affiliated artillery and engineer regiments are added.
Until 1918 the chief of staff of a brigade was known as a Brigade Major. Before 1922, British Army brigades were normally commanded by general officers holding the "one-star" rank of Brigadier-General; after that date the appointment became that of Brigadier, usually held by a field officer with the substantive rank of Colonel.
From 1859 to 1938, "brigade" ("brigade-division" 1885–1903) was also the term used for a battalion-sized unit of the Royal Artillery. This was because, unlike infantry battalions and cavalry regiments, which were organic, artillery units consisted of individually numbered batteries which were "brigaded" together. The commanding officer of such a brigade was a Lieutenant Colonel. In 1938 the Royal Artillery adopted the term "regiment" for this size of unit, and "brigade" became used in its normal sense, particularly for groups of anti-aircraft artillery regiments commanded by a brigadier.
In the Second World War, a Tank Brigade comprised three tank regiments and was equipped with infantry tanks for supporting the Infantry divisions. Armoured Brigades were equipped with cruiser tanks or (US Lend-Lease) medium tanks and a motorised infantry battalion. The armoured divisions included one or more armoured brigades.
The Canadian Forces currently have 3 Regular Force Brigade Groups, known as Canadian Mechanized Brigade Groups: 1 CMBG, 2 CMBG, which contain the regular army's Anglophone units, and 5e GBMC, the regular Francophone formation. These CMBGs are each composed of two mechanized infantry battalions, one light infantry battalion, one armoured regiment, one mechanized artillery regiment, one engineer regiment, one combat service and support (CSS) battalion, and one Military Police platoon. Co-located with each CMBG is a Field Ambulance, a Service Battalion, and a Tactical Helicopter Squadron. Regular Force CMBG strengths are 5,000 personnel. Canada also has 10 Primary Reserve Brigades (Canadian Brigade Group), 31 CBG through 39 CBG, and 41 CBG. The CBG formations are for administrative purposes.
Republic of China (1911–1947) 
An NRA Brigade, 旅, was a military formation of the Chinese Republic's National Revolutionary Army. Infantry and Cavalry Brigades were composed of two Infantry Regiments. After the 1938 reforms the Brigade was dispensed with within the Infantry Division in favor of the Regiment to simplify the command structure.
United States 
In the United States Army, a brigade is smaller than a division and roughly equal to or a little larger than a regiment. Strength typically ranges from 2,500 to 4,000 personnel. During the American Civil War and continuing through World War I Army brigades contained two or more and typically five battalions, but this structure was made obsolete by an Army reorganization before World War II. More recently, the U.S. Army has moved to a new generic brigade combat team in which each brigade contains combat elements and their support units. This formation is standard across the active U.S. Army, U.S. Army Reserve, and the Army National Guard.
In the United States Marine Corps, brigades are only formed for certain missions. Unlike the United States Army, the Marines have intact regimental structures. A Marine brigade is formed only for special expeditionary duty, for which it is outfitted like a smaller Marine Expeditionary Force (MEF). An example is TF TARAWA (2d MEB) during the Operation Iraqi Freedom campaign.
The brigade commander is usually a colonel, although a lieutenant colonel can be selected for brigade command in lieu of an available colonel. A typical tour of duty for this assignment is twenty four to thirty six months.
A brigade commander enjoys an appropriately sized headquarters and staff to assist him in commanding the brigade and its subordinate battalion units. The typical staff includes:
- a brigade executive officer, usually a lieutenant colonel (if commanded by a colonel)
- a brigade command sergeant major
- a personnel officer (S1), usually a major
- an intelligence officer (S2), usually a major
- an operations officer (S3), usually a lieutenant colonel
- a logistics officer (S4), usually a major
- a plans officer (S5), usually a major
- a communications officer (S6), usually a major
- a medical officer, usually a major
- a legal officer (JAG), usually a major
- a brigade chaplain, usually a major
In addition, the headquarters will include additional junior staff officers, non-commissioned officers, and enlisted support personnel in the occupational specialities of the staff sections; these personnel will ordinarily be assigned to the brigade's headquarters and headquarters company.
See also 
- Maj-Gen Sir John Headlam, The History of the Royal Artillery, Vol II (1899–1914), Woolwich: Royal Artillery Institution, 1937.
- Defence, Issue 1, Evidence, July 18, 2001 (afternoon)
- Hsu Long-hsuen and Chang Ming-kai, History of The Sino-Japanese War (1937–1945) 2nd Ed. ,1971. Translated by Wen Ha-hsiung , Chung Wu Publishing; 33, 140th Lane, Tung-hwa Street, Taipei, Taiwan Republic of China.
- (French) Nouveau Larousse illustré, undated (early 20th century)