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.
- "No. 36785". 7 November 1944. https://www.thegazette.co.uk/London/issue/36785/page/
- Morton, James (2008-09-18). "Obituary—Harold Challenor". The Guardian. http://www.guardian.co.uk/politics/2008/sep/18/police. Retrieved 2008-09-18.
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