 In June 1797, Asgill was appointed brigadier-general on the Staff in Ireland.He was granted the rank of major-general on 1 January 1798, and was promoted Third Major of the 1st Foot Guards in November that year.In his Service Records, he states he "was very actively employed against the Rebels during the Rebellion in 1798 and received the repeated thanks of the Commander of the Forces and the Government for my Conduct and Service."