When I was a kid, I recall an old movie whose characters were the actors that usually played British soldiers in WW II movies. It wasn't a WW II movie. It was about a garrison of British soldiers. I think they were in an unnamed African nation. Rebels start an uprising and confine the garrison to its compound. The British soldiers scheme how to get out and get to "the Bofors Gun". One group stands around a piano and sings "Glorious, Victorious" to give the impression that garrison is passive. Another group sneaks out. The plan is successful but an anti-climax since London accepts the rebels as the new government and orders the garrison to support them.
Anyone know the name of this movie? I wasn't that impressed with the movie, but I'm curious about the title.