Fairey Swordfish, part six

In July 1936 the Swordfish entered formally in service with the Fleet Air Arm (FAA) which was, back then, part of the Royal Air Force (RAF).
The 825 Naval Air Squadron was the first one to receive the Swordfish that same month. The Swordfish began replacing both the Fairey Seal and the Blackburn Baffin in both spotter-reconnaissance and torpedo-bomber roles competing with the Blackburn Shark in that combined role. Initially it was the Shark which replaced the Seal in the spotter-reconnaissance roles and the Swordfish replaced the Baffin in torpedo-bomber role. Shortly after the Shark was quickly replaced by the Swordfish. For almost two years during the late 1930s the Swordfish was the sole torpedo-bomber aircraft serving with the FAA.
When the World War 2 started in September 1939, the FAA was transferred to Royal Navy control with a total of 13 operational squadrons equipped with the Swordfish Mk.I plus three flights of float-equipped ones for use off-catapult equipped warships. After the outbreak of the World War 2, a total of 26 FAA squadrons would be equipped with the Swordfish and more than 20 second-line squadrons would also operate it in the training role. During the early months of the war, the Swordfish' action was limited to uneventful fleet protection and convoy escort missions.

Sources:
1. https://en.wikipedia.org/wiki/Fairey_Swordfish
2. http://www.aviation-history.com/fairey/swordfish.html
3. https://www.navywings.org.uk/aircraft/twin-aircraft/swordfish/
4. Signal Squadron - Aircraft In action 175 - Fairey Swordfish in Acti