Deliveries to the Royal Navy began in August 1942. Originally named the Tarpon Mk.I (Changed to Avenger T.R.Mk.I in January 1944) in British service, the Lend-Lease Act Avengers were a mix of TBF-1B and TBF-1C machines. These were essentially the same as the U.S. Navys TBF-1 with British equipment (-1B) or with an additional fuel tank in the bomb-bay and underwing bombracks (-1C). The first 25 were basic U.S. Navy tranferred TBF-1 (presumably still with American equipment). These entered service in early 1943 and were in action in April 1943 in support of the US landings in the Solomons. In total some 627 machines were supplied to the R.N.