Longden was born in
Jamaica (where his father's regiment was stationed) to Major John Longden and Susan,
née Campbell. Duncan Longden served with distinction with the
13th Regiment (Prince Albert's Light Infantry), and also with the
Royal Fusiliers, in
India, and received a medal and clasp for
Sindh and
Balochistan. On resigning his commission after some years service, which included two years as
aide-de-camp to
Sir Charles Napier in India, Captain Longden arrived in Victoria in the
Investigator early in 1854. Longden spent some time at the goldfields. ==Politics==