HMS
Ulysses is similar to the real cruisers, MacLean had served in of that class. The
Ulysses was repeatedly sent on
Arctic convoys without rest. Commander Brooks describes it as the "only ship in the
Home Fleet equipped for carrier command". HMS
Duke of Cumberland is a
King George V-class battleship. A boarding party of
Royal Marines from
Duke of Cumberland was sent to put down a stokers' "mutiny" on
Ulysses before the beginning of the book. Lieutenant Nicholls complains that the
Duke of Cumberland is useless and never deployed to escort convoys. HMS
Stirling is an obsolete World War I-era of the
Ceres sub-group (referred to as
Cardiff Class in the novel).
Stirling is virtually untouched during most of the novel, until the final act where
Stirling is repeatedly attacked by
dive bombers . HMS
Defender,
Invader,
Wrestler and
Blue Ranger, are smaller American-built
escort carriers converted from merchant ships (
Avenger or
Attacker-classes). Accidents and enemy attacks conspire to remove all the carriers from service before the convoy is even halfway to Russia.
Defender in particular is rendered inoperable due to a freak accident: the
flight deck is partially torn off during a heavy storm. Smaller escorts included HMS
Sirrus, an
S-class destroyer, the most newly built warship in the escort group. HMS
Vectra and HMS
Viking, World War I-vintage s. HMS
Portpatrick, a , another obsolete World War I design. HMS
Baliol, a Type 1 described as "diminutive" and completely unseaworthy for the harsh weather of the North Atlantic. Furthermore, there is HMS
Nairn, a
River-class frigate, HMS Eager, a fleet
minesweeper, and HMS
Gannet, a
sloop, nicknamed
Huntley and Palmer due to her boxy
superstructure resembling a biscuit tin. ==Background==