During the #FalklandsWar the Argentinian forces primarily used the Sterling L2A3 submachine gun, which was manufactured in Britain and purchased in large quantities by the junta a mere six months before.
It is moot whether they would have invaded if they did not have this weapon.
A total of 907 people were killed in the Falklands War, including 255 British military personnel, 649 Argentine military personnel, and 3 Falkland Islands civilians.