During World War II, Operation Isabella was a Nazi German plan to be put into effect after the collapse of the Soviet Union to secure bases in Spain and Portugal for the continuation of the strangulation of Great Britain. This concept was laid out by Hitler in May 1941 but was never executed.
Isabella was an early development version of a smaller-scale invasion plan later called Operation Ilona. Much like the related Operation Felix, the plan called for invasion of mainland Spain, as well as the capture of Portugal, Gibraltar and forward operating bases in the Azores and Cape Verde Islands. However, unlike Felix, Isabella assumed that the Spanish forces would at least be sympathetic to the Axis cause and that the invasion of Spain proper would be started only help the Spaniards if Allies invaded of the Iberian Peninsula. To secure the southern flank of the operation, the Wehrmacht was also to capture the Vichy French port of Dakar in North Africa. The strategic objective of the operation would be to prevent the British from using convoy routes to and from the Middle East and India, both through the Suez Canal and Gibraltar and around the Cape of Good Hope.
- Christopher Chant (18 October 2013). "Isabella". The Encyclopedia of Codenames of World War II. Routledge. p. 354. ISBN 978-1-134-64787-3.
- Gerard F. Rutan (1970). "Hitler's Frustrated Conquest". University of Portland Review. Portland: University of Portland. 22: 3–17. ISSN 0041-9923. OCLC 655675137.
- Stanley G. Payne (1987). The Franco regime, 1936–1975. Univ of Wisconsin Press. p. 677. 
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