No territory could be formally claimed prior to being effectively occupied.
However, as late as 1906 only about 6% of that territory was effectively occupied, and the military campaigns had to continue.
Later the area so divided and effectively occupied was renamed Umunoha.
Above all territory must be effectively occupied or it would fall to the partisans; this kept French troops from the battlefield.
After officially surrendering in 1862 his forces effectively occupied the capital of Yunnan.
Jolo was not effectively occupied by Spain until 1876.
Royal troops entered the city, effectively occupied it, and started to dismantle its fortifications.
The island was under nominal Spanish sovereignty since 1668, but it was not effectively occupied until 1885.
It was very large--too large to be effectively occupied by the force which he commanded.
The problem of attacking heavily armed bombers effectively occupied the minds of the Luftwaffe in early 1943.