Sheridan unsuccessfully tried for a political career, firstly being involved in political shenanigans with his father to gain the
Liskeard seat in 1804. He failed to be elected at
Stafford in 1806 and 1807. He briefly served in the army in 1803 under
Lord Moira as
aide-de-camp then in Ireland where he served as a muster-master general in 1806. That year, his father gifted him a 25 per cent share of the
Drury Lane Theatre where Sheridan became the manager. He also undertook managerial duties at the
Lyceum Theatre, London while still managing the Theatre Royal. He wrote poetry, plays and melodramas, including
Description of Characters in 1808 and
The Russian, which was staged for 11 performances at Drury Lane from 13 May 1813. According to the tenor
Michael Kelly, a leading figure in British musical theatre, Sheridan had "a good voice, and a true taste for music". Sheridan's verse about the loss of the frigate,
Saldanha, on the coastline of Ireland on 4 December 1811, was described by Captain Jesse in the biography
The Life of George Brummell as having more originality than any of Sheridan's father's poems. A manuscript for the play
The Siege of St Quintin staged at the Drury Lane Theatre in November 1808 demonstrates the working methods used by Sheridan and his father while managing the theatre. Drafts were read through and checked by Sheridan senior, further revised by the son and then transcribed. While carrying out his army service under Lord Moira in Edinburgh, Sheridan was intimately involved with the wife of Peter Campbell, a wealthy businessman whose work had taken him to the West Indies. The affair led to the break up of the Campbell's marriage and in 1807, Sheridan was convicted of
criminal conversation over it. Campbell was awarded £1,500 compensation, which Sheridan paid with money loaned by actors from the Drury Lane Theatre. Like many of his relatives, including his mother and aunt, Sheridan was afflicted with
tuberculosis and he moved abroad with his wife and eldest daughter to ease the symptoms; he was appointed as the Colonial Governor's treasurer at the
Cape of Good Hope in 1813 as a result of his father's influence with
the Duke of York. ==Legacy and death==