Alarm was cancelled in 1832 and Imogene accidentally burnt in 1840, leaving the sole survivor of the class, Conway, to survive until 1871.

They were intended as sixth rates, which placed them in a category of ships with more than 24 but less than 36 guns, and commanded by an officer of the rank of captain.

[1] These ships were constructed of wood in traditional shipbuilding fashion, although iron braces and trusses were used for increased longitudinal strength.

She recommissioned in 1835 for the Pacific, and during this time she carried some of Charles Darwin's letters and specimens back to the United Kingdom.

This commission saw her travel as far as Australia and New Zealand, and during this time she saw action in the First Opium War, including the capture of Chusan.