If I advance; follow me! If I retreat; kill me! If I die; avenge me!
Source, in full
Mussolini actually repeated this sentence various times but the quote didn't originate with him. Attributed to Mussolini by G. K. Chesterton in G. K's Weekly (1925), and later appearing in "Duce (1922-42)" in Time magazine (2 August 1943), this actually originates with Henri de la Rochejaquelein (1793), as quoted in Narrative of the French Expedition in Egypt, and the Operations in Syria (1816) by Jacques Miot