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In page Neutral Moresnet:

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The First World War resulted in the end of neutrality. On 4 August 1914, Germany invaded Belgium, initially leaving Neutral Moresnet as "an oasis in a desert of destruction".[1] A total of 147 Neutral Moresnet citizens were killed, though it is unclear whether they were killed inside the territory or in fighting outside its borders.[citation needed] On 27 June 1915, Neutral Moresnet was annexed by the Kingdom of Prussia, although the annexation never received international recognition.[citation needed]