02 Jun 1943: #BPark Hut 6 break into "Albatross", Enigma key of German 10th Army in Sicily, ahead of planned Allied invasion there in July.

29 May 1918: Birth of David Rees, mathematician and codebreaker. Recruited to #BPark Hut 6 in December 1939, later joined the Newmanry.

24 May 1941: Mathematician I.J. "Jack" Good joins #BPark Hut 8, helping Alan #Turing with probabilistic analysis of German naval Enigma.

22 May 1940: #BPark Hut 6's David Rees breaks back in to Red (German Air Force) Enigma key using Herivel tip after 3 weeks of blackout.

17 May 1943: #BPark's Cdr. Travis and US Army Intelligence Maj. Gen. Strong draw up "BRUSA Agreement" for cooperation in signals intelligence.

13 May 1944: #BPark Hut 6 break into the "Corncrake" Enigma key, revealing information about the German V-weapons project at Peenemünde.

13 May 1941: U-110 Enigma code books, "pinched" on 09 May, delivered to #BPark Hut 4 by naval intelligence officer Lt. Allon Bacon.

13 May 1902: Birth of Hugh Foss, codebreaker. Developed cryptanalysis of Enigma C in 1927. Head of #BPark Hut 7 (Japanese Navy codes) 1942-3

12 May 1943: Last German Enigma message intercepted from North Africa announces surrender of Afrika Korps. #BPark

10 May 1940: German invasion of France begins. #BPark begin to see clusters of Enigma indicator settings as theorised by John Herivel.