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The Martian armada is headed for Earth ? and Invincible is the only thing that stands in their way! Led by the parasitic SEQUIDS the Martians plan to invade Earth and provide the Sequids with a new slave race. If Invincible fails, it's all over... luckily he brought along some HELP.
The book discusses captains' career development, the opportunities for making money and reputation, how they looked after their crews, and how they were controlled by the Admiralty. It argues that the navy in this period was highly efficient, with promotion being primarily based on merit.