2 Kings 3:21

And when all the Moabites heard that the kings were come up to fight against them, they gathered all that were able to put on armour, and upward, and stood in the border.

Ver. 21. They gathered all that were able to put on armour.] In Scotland, they have an ancient custom, in cases of importance, to command the fire cross to be carried; that is, two firebrands set in fashion of a cross, and pitched upon the point of a spear, and proclamation is thereupon made that all men over sixteen years of age, and under sixty, shall come into the field against the common enemy. a

a Life of King Edward VI, by Sir J. Heywood,