In which film are Richard Burton and Roger Moore mercenaries hired to restore a diposed leader?

"The Wild Geese" is a 1978 British-Swiss 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".

Allen Faulkner (Richard Burton), a former British Army colonel turned mercenary, arrives in London to meet merchant banker Sir Edward Matheson (Stewart Granger). The latter proposes an operation to rescue Julius Limbani (Winston Ntshona), the imprisoned President of a southern African nation who is due for execution by General Ndofa. President Limbani is held in a remote prison in Zembala, guarded by a regiment of General Ndofa's troops known as the "Simbas".

Faulkner accepts the assignment and begins recruiting forty-nine mercenaries, including officers he had worked with previously: Capt. Rafer Janders (Richard Harris), a skilled tactician, and Lt. Shawn Fynn (Roger Moore), a former RAF pilot.