What is the theme in The Mauritius Command by Patrick O'Brian?

The novel features a dominant theme of war, even more than most of the novels in the series of novels. Aubrey's initial presentation as a participant in domestic life only serves to underscore his career as a military man—at the first opportunity, he willingly leaves home and sets out to war. Thus, his personal life is allowed only insofar as it does not interfere with his military duties. This dedication is echoed by the dedication of the many other officers and men sailing with Aubrey, such as Clonfert, Corbett, Pym, and Pullings. It is paralleled by Maturin's dedication and, indeed, even by the dedication of the French military officers.