História

Autor: John Warwick Brooke

Título: Types of ordnance. British guns - elevated position mobile mount at the front during World War I

Data: August 1916

Origem: http://www.defenseimagery.mil/imagery.html#guid=6c81d8f2f119f68051da17e169f72cfb3bfb7f47

Fonte: https://commons.wikimedia.org/wiki/File:British_artillery_in_action,_World_War_I.JPEG

Licença: Domínio Público