Ship sailed unescorted throughout the war, although they were more and more likely to be in convoy as time went on. Some vessels simply could not make a convoy rendezvous time. Others straggled from convoys and ended up solo. Still others were expected to be able to survive solitary passages due to their speed. These included modern tankers, refrigerated ships, and large liners, many of which had powerful engines that made them about as fast as a surfaced U-Boat.
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