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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #II. Occupied territory #A. Definition - Art. 41.
Art. 41. Territory is regarded as occupied when, as the consequence of invasion by hostile forces, the State to which it belongs has ceased, in fact, to exercise its ordinary authority therein, and the invading State is alone in a position to maintain order there. The limits within which this state of affairs exists determine the extent and duration of the occupation.