Which paper/mag is it please Majesty?
Is it a cryptic? I can't find a Sir HET Atkinson which makes me think it's a crytic clue
You could look in Crosswords to see if anyone has asked these in there
26, en.wikipedia.org/wiki/Carleton's_Raid
Carleton's Raid was a British raid led by Major Christopher Carleton during the American War of Independence, conducted in fall 1778
en.wikipedia.org/wiki/Edward_Atkinson_(lawyer)
After studying at Harrow School, Atkinson matriculated to Trinity College, Oxford, where he was known by his friends as "Tatters". After gaining a third in classics ...