This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Belgian Troops with Early Gas Masks. Belgian machinegunners with very early gas masks during World War From The Great War The Standard History of the All Europe Conflict volume four edited by Wilson and Hammerton Amalgamated Press London as found on www firstworldwar firstworldwar Original text on web site is copyrighted original