| Operation Hardboiled | |
|---|---|
| Part of World War II | |
| Operational scope | Operational |
| Location | 58°34′N 5°26′E / 58.57°N 5.43°E |
| Planned | 1942 |
| Planned by | London Controlling Section |
| Objective | German belief in an amphibious invasion of Stavanger, Norway |
| Executed by | Royal Marines Division |
| Outcome | Limited success |
  Stavanger The operation targeted Stavanger, Norway | |
Operation Hardboiled was a Second World War military deception. Undertaken by the Allies in 1942, it was the first attempt at deception by the London Controlling Section (LCS) and was designed to convince the Axis powers that the Allies would soon invade German-occupied Norway. The LCS had recently been established to plan deception across all theatres, but had struggled for support from the unenthusiastic military establishment. The LCS had little guidance in strategic deception, an activity pioneered by Dudley Clarke the previous year, and was unaware of the extensive double agent system controlled by MI5. As a result, Hardboiled was planned as a real operation rather than a fictional one. Clarke had already found this approach to be wasteful in time and resources, preferring to present a "story" using agents and wireless traffic.
Resistance to the operation by the chosen units meant that much of the preparation was not completed. Adolf Hitler ordered the reinforcement of Scandinavia in March and April 1942, before Hardboiled was shelved in May. It is unclear to what extent the operation contributed to his decision. Despite its limited impact, the operation gave the LCS experience in planning deceptions, and laid the groundwork for future exploitation of Hitler's belief that Northern Europe was strategically important.