Asgill was promoted to lieutenant general in January 1805. At a court martial held at the Barracks, Dublin, on 30 December 1805, charges were laid against Lieutenant Colonel Charles Belson of the 2nd Battalion of the 28th Regiment of Foot regarding a punitive punishment he ordered against Private Patrick Reardon of that regiment: "causing to be carried into immediate execution a corporal punishment of two hundred lashes, and, after his recovery from the effects of his punishment, by keeping him two or three hours a day at the dumb-bells". Reardon had been transferred from the first battalion, "in which he had served several years, to the second, in consequence of infirmity and inability to undergo the duties and fatigues of general active service". Belson's orders had been carried out while Reardon's case was still under consideration by Lieutenant General Sir Charles Asgill. The Court, therefore, sentenced Belson to be "reprimanded in such manner as His Majesty may think proper to direct"... "In his defence they cannot adjudge him Guilty of any criminal disobedience of orders", and was acquitted of that charge. Although "in some of the matters of the preceding charges, there has been a degree of irregularity and want of due discretion on the part of Lieutenant Colonel Belson". The Court also found Belson not guilty of gross disrespect to Asgill.