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". The London Gazette (Supplement). 7 November 1944. p. 5131.
- Morton, James (2008-09-18). "Obituary—Harold Challenor". The Guardian. Retrieved 2008-09-18.
- Claudio Biscarini. "Eroi sconosciuti: l'Operazione Speedwell tra Liguria e Toscana". Della storia d'Empoli (in Italian). Archived from the original on 2018-05-01.
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