1) Brig 2) Nine 1) Headquarters 2) Military headquarters 
• (n.) A building which is occupied by the guard, and in which soldiers are confined for misconduct; hence, a lock-up.
Guard'house` noun (Mil.) A building which is occupied by the guard, and in which soldiers are confined for misconduct; hence, a lock-up. 
[n] - a military facility that serves as the headquarters for military police and in which military prisoners can be detained
noun a military facility that serves as the headquarters for military police and in which military prisoners can be detained
a building used for housing military personnel on guard duty. · a building used for the temporary detention of military prisoners.