The Last Grenade

The Last Grenade is a 1970 British war film directed by Gordon Flemyng and starring Stanley Baker and Alex Cord as two soldiers of fortune, formerly comrades, who now find themselves on opposite sides. The cast also includes Richard Attenborough, Honor Blackman, Rafer Johnson, John Thaw, Andrew Keir, and Julian Glover. It was the final feature film directed by Flemyng.

Beginning in the Congo, a group of mercenaries led by British Major Harry Grigsby Stanley Baker are due to be picked up by helicopters after completing a mission. As they board the choppers they are fired on from the helicopters by another group of mercenaries led by American Kip Thompson Alex Cord who has been hired to change sides.Recovering in England, Grigsby is recruited by HM Government to take out Thompson who has been hired by Red China to stir up trouble in the New Territories between Hong Kong and Red China. As neither nation wants open warfare with each other, each side hires expendable mercenaries. Grigsby recruits his surviving old crew including Rafer Johnson, John Thaw, Andrew Keir, and Julian Glover. ........

Source: Wikipedia