Must learn not to post so fast. Although you might understand "Ships That Pass" perfectly without the following explanation (from the same site where I found the missing verse), I found it informative:

"Originally published in Small Craft, by C. Fox Smith, Elkin Mathews, Ltd., 1917.

"I speculate, from references to war and contraband - and the vintage of the poem - that the Cruiser Patrol was a World War I duty intended to restrict shipping of supplies to Germany. By this time, attrition was catching up with the sailing ships; no new ones were being built, and their numbers were dwindling as they were lost or destroyed.

"Meanwhile, those which were still seaworthy but not economical to run in the heavily industrialized English economy were "sold foreign", to less developed economies with labor costs - and absence of safety or loading regulations - which could turn a profit on sail. Such was the fate of this ship."