You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
For those interested in such things, in 1969 the Irish government conducted preparations for the invasion of the United Kingdom's province of Northern Ireland. Had Operation: Armageddon gone ahead, it would have brought the HMG and the Dublin government to a state of war. Being a territorial invasion of a NATO member by a foreign power it may also have triggered the NATO declaration of war in the Republic of Ireland.