[1807]. When troop stable guards are mounted they will guard the stables of the cavalry. When no stable guards are mounted, the stables will be guarded by sentinels posted from the main guard, under the control of the officer of the day.
The instructions given for troop stable guard will be observed as far as applicable by the noncommissioned officers and sentinels of the main guard when in charge of the stables. (309)
Troop Stable Guards
[1808]. Troops stable guards will not be used except in the field, or when it is impracticable to guard the stables by sentinels from the main guard. (310)
[1809]. Troop stable guards will be under the immediate control of their respective troop commanders; they will be posted in each cavalry stable, or near the picket line, and will consist of not less than one noncommissioned officer and three privates.
Stable guards are for the protection of the horses, stables, forage, equipments, and public property generally. They will in addition enforce the special regulations in regard to stables, horses, and parks. (311)
[1810]. Sentinels of stable guards will be posted at the stables or at the picket lines when the horses are kept outside. The troop stable guard may be used as a herd guard during the day time or when grazing is practicable. (312)
[1811]. The troop stable guard, when authorized by the post commander, will be mounted under the supervision of the troop commander. It will be armed, at the discretion of the troop commander, with either rifle or pistol. (313)
[1812]. The tour continues for 24 hours, or until the guard is relieved by a new guard. (314)
[1813]. The employment of stable guards for police and fatigue duties at the stables is forbidden; but this will not prohibit them from being required to assist in feeding grain before reveille. (315)