"A battalion is a military unit. The use of the term "battalion" varies by nationality and branch of service. Typically a battalion consists of 300 to 800 soldiers and is divided into a number of companies. A battalion is typically commanded by a lieutenant colonel. In some countries, the word "battalion" is associated with the infantry.
The term was first used in Italian as battaglione no later than the 16th century. It derived from the Italian word for battle, battaglia. The first use of battalion in English was in the 1580s, and the first use to mean "part of a regiment" is from 1708." - (en.wikipedia.org 14.06.2020)
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