In July 1838 he was appointed to HMS Samarang under Captain William Broughton and saw action in China in the First Opium War.
In these actions the Samarang was accompanied by HMS Nemesis in the movement from Macao to Whampoa, known as the Pearl River delta.
In this action they captured or destroyed five forts, one battery, two military stations and nine Chinese men-of-war, the latter totalling 115 guns.
His most unusual duty in later life was the escorting of the body of Admiral Philip Durham from Malta to Britain in April 1845.
[10] His eldest son James St Clair Bower was killed (with five others) on the Solomon Islands whilst ashore from HMS Sandfly in October 1880, aged 27.
His older brother Alexander Bower was declared legal descendant of William St Clair of Roslin and awarded a coat of arms in recognition.