An essential duty in any military encampment or fortified position. An officer would oversee a guard detail, supported by a serjeant. Guards were posted by the Corporal of the Guard. 

Satire on military recruitment: a plump young man in a ragged apron stands between a young woman who clings to his arm and the recruiting sergeant who offers him a tankard of beer and places a military hat with a cockade on his head; the young man has alrady donned a striped military waistcoat which matches that of the drummer standing in the background to right drinking from a glass; on the tavern wall behind is a notice reading, 'All aspiring Young Men who despise Slavery ...'.

Source: The British Museum

https://www.britishmuseum.org/collection/object/P_1935-0522-1-56

Gathering and chopping firewood, getting water, cooking, cleaning of kit