Asgill was appointed Colonel of the Regiment of the 5th West India Regiment (February 1806); of the 85th Regiment of Foot (October 1806); and of the 11th (North Devonshire) Regiment (25 February 1807), for which he raised a second battalion in the space of six months. He mentions the men of the 11th in his will, in a Codicil written on 15 July 1823, eight days before his death. "The sum of eight hundred pounds £95,852 in 2020 which are at my agent's hands, Messrs. Greenwood & Co., Grays Court, agents, or will be deposited this month at my off reckoning, for the cloathing of the 11th Foot, due to me."