the lieber code
http://avalon.law.yale.edu/19th_century/lieber.asp
section i
martial law - military jurisdiction - military necessity - retaliation
article 1.
a place, district, or country occupied by an enemy stands, in consequence of the occupation, under the martial law of the invading or occupying army, whether any proclamation declaring martial law, or any public warning to the inhabitants, has been issued or not. martial law is the immediate and direct effect and consequence of occupation or conquest.
the presence of a hostile army proclaims its martial law.
art. 2.
martial law does not cease during the hostile occupation, except by special proclamation, ordered by the commander in chief; or by special mention in the treaty of peace concluding the war, when the occupation of 。。。