In May 1941, Allied commanders on Crete knew the date of the German invasion, the drop zones, and the airfields being targeted, thanks to Enigma decrypts from Bletchley Park. They outnumbered the attackers nearly two to one. And they still lost the island. This episode examines Operation Mercury, the first massive primarily airborne invasion in history, as the ultimate case study in the limits of intelligence and the friction of war.

We look at why Churchill saw Crete as a strategic linchpin near the Romanian oil fields, why Hitler treated it as a distraction from Barbarossa, and how General Bernard Freyberg had to disguise Ultra intelligence as reports from a fictional spy while being ordered not to crater the airfields. We then follow the German paratroopers dropped at 300 to 400 feet with single-riser harnesses and only pistols, slaughte ...