Danger UXB is only a play.
 Chapter 8 covers the Grimsby Raid of June 13, 1943, which forms the basis for "Butterfly Winter" and includes the development of the string-and-pulley system for moving the SD2s about, the bombs in the bean field, and the inspiration for Sergeant James being blown off the stone wall and breaking his arm
== Books ==Hartley's book, a non-fiction memoir of technical information and anecdotes, provided some of the major story developments

