Small craft supply the visible movement expected from a fleet while Lancaster bombers drop metallic strips in patterns designed to create large radar returns. The combined signals make empty stretches of the Channel look occupied by squadrons and invasion flotillas. British intelligence then reads German reactions through Ultra rather than assuming that the illusion worked. A weak response becomes evidence for revising timing, spacing, or presentation in the next operation, turning deception into an iterative feedback process.
Notable Point · 2:47:24-2:48:28
Bodyguard measures and refines its radar illusions
Small craft and Lancaster-dropped chaff create apparent flotillas, while Ultra reveals German reactions so later deceptions can be adjusted when an illusion fails.