The principle is known as occupatio bellica. The principle refers to peaceful seizure of an unused land without claim.
Provision of the principle
It is a provisional control by a ruling power to take over a territory, without a claim of formal sovereignty. Occupation is distinguished from annexation and colonialism by its intended temporary duration. While an occupant may set up a formal military government in the occupied territory to facilitate its administration, it is not a necessary precondition for occupation.
Therefore, the correct answer is occupatio bellica.
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