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Source/Further reading:

Gibraltar in WWI:
http://livelb.nationalarchives.gov.uk...
https://encyclopedia.1914-1918-online...

Gibraltar in WWII:
https://www.visitgibraltar.gi/history...

Air Raids during WWII:
https://weaponsandwarfare.com/2020/05...

Operation Felix: https://warfarehistorynetwork.com/201...
https://www.jstor.org/stable/260712 https://www.historyextra.com/period/s...

Operation Tracer:
https://web.archive.org/web/201309051... https://www.independent.co.uk/news/uk...

David Scherr vs the Saboteurs:
https://www.mi5.gov.uk/the-battle-for...

The Queen of Hearts: https://books.google.com/books/about/...

The Italian Frogmen raids:
https://www.anaim.it/decima/operazion...
https://www.marina.difesa.it/noi-siam...

Albert Pierrepoint
http://sro.sussex.ac.uk/id/eprint/601...

Franco’s Blockade
https://english.elpais.com/elpais/201...
http://web.mit.edu/cascon/cases/case_...
https://theworldunreported.com/2020/1...

Brexit:
https://www.bbc.com/news/amp/world-eu... https://foreignpolicy.com/2021/03/10/...