Brigadier General

A brigadier general will generally command a brigade, although the rule does not seem to be strict.
The rank of Brigadier General in the British Army was abolished in 1922 (for its insignia refer to General). It was replaced initially by a senior ranking Colonel and then in 1928 by the rank of Brigadier. The old name of Brigadier General has since been reintroduced in Canada and some other Commonwealth countries.
In the Royal Air Force and many other airforces that do not use ranks based on those of the army, the equivalent rank is an Air Commodore.
See also: wiktionary definition of . Comparative military ranks