John B. Wilson, Maneuver and Firepower: The Evolution of Divisions and Separate Brigades (1998)
“ When a brigadier general commanded a brigade, his brigade major and aides were included in the staff. Major generals continued to command divisions, and their staffs consisted of a quartermaster, judge advocate, and two aides. The official handbook for infantry compiled by William Duane, the Adjutant General, in 1813 called for a brigade in the peace establishment to consist of any number of battalions, but for field service it was not to exceed 4,000 men. A division could have from two to four brigades. ”
