Albert Einstein on Nuclear war

Albert Einstein, discussing the letter he sent Roosevelt raising the possibility of atomic weapons, in "Atom: Einstein, the Man Who Started It All", Newsweek magazine (March 10, 1947)

Wikiquote: "Nuclear war" (Quotes, 1940s)

Albert Einstein, in an interview with Alfred Werner, Liberal Judaism, no. 16 (April–May 1949), Einstein Archive 30-1104, as reported in Alice Calaprice, The New Quotable Einstein (2005), p. 173

Differing versions of such a statement are attributed to conversations as early as 1948 (e.g. The Rotarian, vol. 72, no. 6 (June 1948), p. 9: "I don't know. But I can tell you what they'll use in the fourth. They'll use rocks!"). Another variant ("I do not know with what weapons World War III will be fought, but World War IV will be fought with sticks and stones") is attributed to an unidentified letter to Harry S. Truman in "The culture of Einstein" by Alex Johnson, MSNBC, (18 April 2005). However, prior to 1948 very similar quotes were attributed in various articles to an unnamed army lieutenant, as discussed at Quote Investigator: "The Futuristic Weapons of WW3 Are Unknown, But WW4 Will Be Fought With Stones and Spears". The earliest found was from “Quote and Unquote: Raising ‘Alarmist’ Cry Brings a Winchell Reply” by Walter Winchell, in the Wisconsin State Journal (23 September 1946), p. 6, col. 3. In this article Winchell wrote:


Joe Laitin reports that reporters at Bikini were questioning an army lieutenant about what weapons would be used in the next war.
"I dunno," he said, "but in the war after the next war, sure as Hell, they’ll be using spears!"

Wikiquote: "Nuclear war" (Quotes, 1940s)