Secret weapons are examined. Included: one of the largest booby traps in history; Mithridates' use of a flammable mud in a revolt against Rome; precursors to modern letter bombs. Also: the tactics of Spartacus.
History's most formidable defenses are examined, including England's great castles; underground defenses in Cappadocia, Turkey; and the ancient Mayan killer-bee method. Also: a study of a replica of a section of the ancient Roman fort of Alesia; and the firing of a cannon used to break through the defenses of Constantinople.
Unusual medical practices are examined and, in some cases, tested on patients. Included: the use of leeches as a cure; the transfer of an electrical charge using a live torpedo fish. Also: trepanning, which the Inca performed to relieve pressure on the brain; Roman battlefield-surgery techniques and tools; the brain surgery performed on England's Henry V to remove an arrow from his skull.