13 November 1936,
700 Irish Brigade soldiers joined the Francoists. They belonged to the fascist movement Blueshirts, with ultra-liberal and anti-communist positions. In the Jarama War in Andalusia, by a misunderstanding, they faced the Falangist battalion of their sides in the Canary Islands. In April 1937, Franco dissolved the Irish Brigade and sent the soldiers back to Ireland.
Source:
Judith Keene, Fighting for Franco: International Volunteers in Nationalist Spain During the Spanish Civil War.