- Who
- Colossus Mark 1
- What
- first
- Where
- United Kingdom ()
- When
Operational from February 1944, the Colossus Mark 1 was the world’s first code-breaking computer. Designed by engineer Tommy Flowers (UK), the computer was based at Bletchley Park in Buckinghamshire, England. The Mark 2 version, which came on-line on 1 June 1944, was used to crack German codes in the run-up to the Normandy Landings of 6 June 1944, revealing crucially that Adolf Hitler had not requested extra troops to be placed within the landing zones.
