During World War II, Operation Speedwell was an early Special Air Service raid against Italian rail targets near Genoa starting on 7 September 1943. The fourteen-man group split into a number of smaller units to destroy track and ambush trains. The raiders returned to friendly lines by foot after up to seven months behind enemy lines.
- The London Gazette: . 7 November 1944. Retrieved 2008-09-18.
- Morton, James (2008-09-18). "Obituary—Harold Challenor". The Guardian. Retrieved 2008-09-18.
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