Editing Sopwith Pup (section)

===Home Defence duties===
The raids on London by [[Gotha G.IV|Gotha]] bombers in mid-1917 caused far more damage and casualties than the earlier airship raids. The ineffective response by British interceptor units had serious political repercussions. In response, [[No. 66 Squadron RAF|No. 66 Squadron]] was withdrawn to Calais for a short period, and [[No. 46 Squadron RAF|No. 46]] was transferred for several weeks to [[RAF Hornchurch|Sutton's Farm airfield]] near London. Two new Pup squadrons were formed specifically for Home Defence duties, [[No. 112 Squadron RAF|No. 112]] in July, and [[No. 61 Squadron RAF|No. 61]] in August.

The first Pups delivered to Home Defence units utilised the {{cvt|80|hp}} Le Rhône, but subsequent Home Defence Pups standardised on the more powerful {{cvt|100|hp}} [[Gnome Monosoupape]], which provided an improved rate of climb. These aircraft were distinguishable by the addition of vents in the cowling face.<ref name="Bruce Flight p10">Bruce 1954, p. 10.</ref> In 1917, the Admiralty acquired the Sopwith Pup. <ref>{{Cite book |last=Iredale |first=Will |title=The Kamikaze Hunters |publisher=Macmillan |year=2015}}</ref>