Keywords: Supermarine P.B.31E Nighthawk.jpg Side-view of the only Supermarine Nighthawk built a British quadruplane intended for use as an anti-Zeppelin aircraft The aircraft was equipped with a searchlight and armed with one offensive 1 5 pounder Davis gun with 20 rounds and a number of defensive Lewis guns P04460 019 between 1917 1918 author Institution Australian War Memorial PD-Australia the Government of Australia <small>Per the link above to the Australian government site where the image was found the Australian government considers this to be public domain worldwide http //www awm gov au/copyright/</small> Supermarine Nighthawk Night fighter aircraft Quadruplanes |