The raid lacked the heavy naval support that a mined approach and fortified objective demanded. Troops also went ashore without overwhelming numbers, sufficient air cover, or adequate intelligence about the beach. Its losses were not necessary to discover unique lessons in this interpretation, because earlier wars and operations had already demonstrated the need for preparation and superiority. The failure is placed partly in institutional ambition and Mountbatten's rapid advancement without enough staff and higher-command experience. Mountbatten later grew into strategic command, but Dieppe shows the danger of accelerating an officer through levels without enough seasoning in each role.
Chapter · 38:20-44:40
Dieppe showed what fortified ports do to under-supported raids
Dieppe is presented as a failed attempt to attack a defended port without sufficient minesweeping, naval gunfire, air support, intelligence, or overwhelming land power.