"Fatigue Call" is a
bugle call
A bugle call is a short tune, originating as a military signal announcing scheduled and certain non-scheduled events on a military installation, battlefield, or ship. Historically, bugles, drums, and other loud musical instruments were used ...
which signals all designated personnel to report for
fatigue duty
Fatigue duty (or fatigue labor) is the labor assigned to military men that does not require the use of armament. Parties sent on fatigue duty were known in English by the French term "en détachement" according to an 1805 military dictionary.
H ...
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References
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Bugle calls