[1] He travelled with the 1st Battalion of his regiment to serve in the Flanders campaign on 25 February 1793, fighting at the Battle of Famars on 23 May and then at the beginning of the siege of Valenciennes in the same month.

[4][5] Moore fought the Battle of Corunna on 16 January, but while Anson took part in it the battalion was only lightly engaged.

Anson spent only a very brief period on Wellington's staff, because on 9 April he was appointed to replace Major-General James Kemmis as commander of the 1st Brigade of the 4th Division.

[7] On 18 July Anson led his brigade at the Battle of Castrillo, a running combat that took place over several hours around Castrejon.

Anson's brigade was in reserve, and Wellington ordered them forward in line to face Brenier's columns; with his line longer than the front of the French columns, Anson was able to wrap around the attacking French force before it could deploy, firing into it and forcing it back towards the Guareña.

[10] From its position the brigade was able to help cover Colonel Denis Pack's brigade as it retreated beneath the hill, and then provided great assistance in the destruction of the main French assault as it attacked the centre of the British line in the mid afternoon, attempting to force the gap in the line next to the Lesser Arapile.

He continued in temporary command as the army advanced towards Madrid, before relinquishing the division back to Cole upon his return in October.

In December a change in senior officers in the army was occurring, and it was expected that as part of this Anson would be given command of the Guards Brigade again, but this position instead went to Colonel Peregrine Maitland.

He was made a Knight Commander of the Order of the Bath on 2 January 1815, and in 1816 joined the Consolidated Board of General Officers.

[8][12] For his service in the Peninsular War he also received the Army Gold Medal with three clasps, having been mentioned in dispatches four times.

[1][8][13] Anson died on 13 January 1847 at Brockhall, Northamptonshire at the age of 74, and was buried in the family catacombs at Kensal Green Cemetery, London.

[8][2] Military historians Ron McGuigan and Robert Burnham describe Anson as a "tough but fair disciplinarian", giving as proof the wide variety of verdicts he gave in courts martial presided over by him.