- the annual day for enrollment in the militia of all able men aged 18 to 45, according to a law established in 1792 and in effect until after the Civil War.
Examples from the Web for muster day
Historical Examples of muster day
And now comes dinner,—a most important feature of muster-day.
A very different affair is the "muster-day" of the early fall, before the cold days and nights have come to stay.
It is Sunday, and muster-day, and the Alabama has once more been put in perfect order.
Quarterly training or muster-day became an occasion more noted for the rum then consumed than for the drilling done.The Old First Massachusetts Coast Artillery in War and Peace
Frederick Morse Cutler
As a child, I loved to see the colors of the holiday-soldiers flapping in the wind and flaunting in the sun on "muster-day."