[3] It was planned for the squadron to become operational and deploy to France in September however it was instead disbanded on 1 August 1918, thus never seeing active service in the First World War.

125 Squadron was reformed on 16 June 1941 at RAF Colerne equipped with Bolton-Paul Defiant night fighters.

After discovering a surplus of revenue, the commission presented the British Government with $500,000 to establish a squadron with the hope that it would be manned by Newfoundlanders.

125 Squadron in its early days along with a contingent of English, Scottish, Welsh, Commonwealth and Polish pilots.

[5] On 24 September 1941, the squadron moved to RAF Fairwood Common, Wales and became fully operational, with the Defiant proving to be a more than effective night fighter.

[5] From October to December 1942, the squadron operated a detachment at RAF Sumburgh in the Shetland Islands.

125 Squadron moved north to RAF Valley on 14 November 1943 in order to carry out patrols over the Irish Sea.

[6] From Coltishall the squadron defended against enemy intruders and Heinkel He 111s carrying flying bombs, as well as undertaking reconnaissance to locate the remainder of German shipping.

125 Squadron reformed on 31 March 1955 at RAF Stradishall, Suffolk as a night fighter unit operating Gloster Meteor NF.11s.