The King's Commission by Dewey Lambdin

Fresh from duty on the frigate Desperate in her fight with the French Capricieuse, Alan Lewrie is commissioned first officer of the big o'war Shrike. He must bring the Muskogees and the Seminoles onto the British side against the American rebels--with time out, of course, for some other kind of action.

The King's Coat by Dewey Lambdin

1780: Seventeen-year-old Alan Lewrie is a brash, rebellious young libertine. So much so that his callous father believes a bit of navy discipline will turn the boy around. Fresh aboard the tall-masted Ariadne, Midshipman Lewrie heads for the war-torn Americas, finding-rather unexpectedly-that he is a born sailor, equally at home with the randy pleasures of the port and the raging battles on the high seas. But in a hail of cannonballs comes a bawdy surprise. . .