Radio broadcast, 29 Dec. 1940. According to Walter Isaacson and Evan Thomas, The Wise Men (1986), this slogan was picked up for Roosevelt's address after it was used in conversation by John McCloy, who had gotten it from Jean Monnet.
"Jack Wilshere interview: Paolo Di Canio was my boyhood hero... but I'll show no mercy to Hammers today". Daily Mirror Interview, www.mirror.co.uk. January 14, 2011.