Operation Osprey was a plan conceived by the German Foreign Ministry and Abwehr II. mid-1942. The plan was an enlargement of Operation Whale. Planning took place in the context of American troops landing in Northern Ireland 26 January 1942, and Hitler's immediate fears surrounding this.

Operation Green often also referred to as Case Green or Plan Green, was a full-scale operations plan for a Nazi German invasion of Ireland planned by an unknown German officer known by the alias "Hadel" in support of Operation Sea Lion, the invasion of the United Kingdom, during World War II. Despite its detailed nature, Operation Green is thought to have been designed only as a credible threat, a feint, not an actual operation. Plan W, a planned occupation of all of the Free State by the British Armed Forces, was drafted by the British military in secret liaison with the Irish government to counteract any German invasion.