1795 Hospital Mate.
18 Nov 1795 Surgeon 4th West India Regiment.
5 August 1796 Surgeon 27th (Inniskilling) Regiment of Foot.
Malta Nov 1800 Arrived with his regiment as part of Sir Ralph Abercrombie's Expedition to Egypt.
25 June 1801 Died at Aboukir from plague. Plague broke out at Alexandria in May 1801. Surgeon Allen died of the disease and cases were isolated. The disease appeared later in Rosetta where Surgeon Halliday 27th Regiment died of it.