Brigade refers to a detachment of 3,000 to 5,000 soldiers. Historically cavalry units operated on horseback, and were especially popular during the revolutionary and civil war. However, in modern times the term, "Cavalry" is generally attributed to any military unit that utilizes fast, highly mobile units (often armored) during deployment. The military almost exclusively uses the term "cavalry" for units utilizing helicopters, Put the two together, and a cavalry brigade is a military detachment of 3,000 to 5,000 soldiers that utilizes vehicles in the event of its deployment (most likely helicopters).
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