Sackville, Flower-class manning, and convoy value

The main HMCS Sackville and Flower-class chapter begins with Canadian service and engineering detail omitted from the earlier ship video. Scotch boilers resembled locomotive practice closely enough that industrial communities able to build and repair railway boilers had useful skills for these escorts. The Flower's whaler ancestry is then separated from loose descriptions of the class as derived from generic fishing boats. Wartime personnel problems also receive a more precise treatment, separating total manpower from the difficulty of placing trained sailors where ships needed them. The chapter closes with the Flower class as a practical convoy-war solution whose numbers and availability let it spoil U-boat attacks despite modest individual performance.