Alternative military net designs for mosquito protection. (A) Mosquito net with bell tent design as supplied to French soldiers in Salonika, Macedonia (source: The Times History of the War), . (B) Bivouac net opened to show interior. The ledges forming beds are dug down to a depth of 9 inches and the trench for feet is dug down to a depth of 18 inches (published with permission of the Royal army Medical Corps Journal), . (C) Modified Bivouac net supplied to British soldiers in Macedonia in 1918. The net is intended for two men and is covered by the two bivouac sheets. The front slides up and down the guy rope (published under the Open Government Licence, v 2.0), . (D) Same net as in (c) showing alterations to improve protection (published under the Open Government Licence, v 2.0) .