The Wild Geese is a 1978 British-Swiss epic war film directed by Andrew V. McLaglen and starring Richard Burton, Roger Moore, Richard Harris, and Hardy Krüger. The screenplay concerns a group of mercenaries in Africa. It was the result of a long-held ambition of its producer Euan Lloyd to make an all-star adventure film similar to The Guns of Navarone or Where Eagles Dare. The same producer and director were later responsible for The Sea Wolves.
The screenplay by Reginald Rose was based on an unpublished novel titled The Thin White Line by Daniel Carney. The film was named The Wild Geese after the Wild Goose flag and shoulder patch used by Michael "Mad Mike" Hoare's Five Commando, ANC, which in turn was inspired by a 17th-century Irish mercenary army (see Flight of the Wild Geese). Carney's novel was subsequently published by Corgi Books under the same title as the film.
(Summary from Wikipedia)