Which groundbreaking advertising campaign first used the slogan 'The Gun That Won The West' to market a military product that became an American icon?

The military equipment industry has a fascinating history of marketing campaigns that shaped public perception and recruitment. Behind some of the world's most powerful defense contractors are advertising strategies that helped define national identity during wartime and peace. This trivia question focuses on one of the most influential advertising campaigns in military history that revolutionized how military products were marketed to governments and the public.

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Winchester's 1873 rifle campaign (1875)
Colt's Single Action Army revolver marketing (1880)
Remington Arms' frontier series advertisements (1883)
Smith & Wesson's Model 3 promotional materials (1870)