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A proclamation may help fix the date of the beginning of the occupation. The proclamation may also advise inhabitants of occupied territory of the rules with which they must comply. In particular, the proclamation may be used to advise inhabitants of changes to law,including penal law.

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The question of whether territory is occupied does not depend upon the issuance of any particular proclamation or other instrument. Territory may be occupied even though no proclamation of occupation has been issued.

Conversely, the issuance of proclamation of occupation does not empower a State with the rights of an Occupying Power if it does not control such territory in fact.A proclamation may help fix the date of the beginning of the occupation.

11.2.4 Proclamation of Occupation.

Due to the special relations established between the civilian population of the occupied territory and the Occupying Power, the fact of military occupation and the territory over which it extends should be made known to the citizens of the occupied territory and to other States.

However, there is no specific legal requirement that the Occupying Power issue a proclamation of military occupation.

while the third may be denominated MARTIAL LAW PROPER, and is called into action by Congress, or temporarily, when the action of Congress cannot be invited, and in the case of justifying or excusing peril, by the President, in times of insurrection or invasion, or of civil or foreign war, within districts or localities where ordinary law no longer adequately secures public safety and private rights.

may be called jurisdiction under MILITARY LAW, and is found in acts of Congress prescribing rules and articles of war,
or otherwise providing for the government of the national forces;

the second may be distinguished as MILITARY GOVERNMENT, superseding, as far as may be deemed expedient, the local law, and exercised by the military commander under the direction of the President, with the express or implied sanction of Congress;