Sometimes you come across a word you were never quite sure of and find out there's a reason: there are two words with similiar spelling and -- if not exactly similiar meanings -- at least meanings apt to crop up in the same sort narratives.

ord·nance

military supplies including weapons, ammunition, combat vehicles, and the necessary maintenance tools and equipment

or·di·nance

a) an authoritative decree or direction b) a public enactment, rule, or law promulgated by governmental authority

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