battalions, unlike most divisions which attacked with two brigades ("two up") and one in reserve. However, his division was driven back by German counterattacks. Cambrai Harper's 51st Division also took part in the Battle of Cambrai in November 1917. Harper's tactical plan for Cambrai was for his infantry to follow the tanks in line. He was entitled to draw up his own plan under "Field Service Regulations", and Braithwaite of 62nd Division had also adopted his own tactics. These tactics were based on previous experience of infantry-tank cooperation, and concern that infantry in column might suffer excess casualties before being able to return fire. Christopher Baker-Carr later claimed in his memoirs (From Chauffeur to Brigadier – 1930) that the attack on Flesquieres failed as a result of Harper using his own idiosyncratic tactical drill. Although widely repeated, this claim is dismissed by Bryn Hammond as "plainly rot" – Baker-Carr made no such complaint at the time (he in fact praised the arrangements), it is not corroborated in other contemporary accounts, and it was Baker-Carr's own brigade which failed. To retake Fontaine on 23 November, Harper concurred with the brigade commander Henry Pelham Burn's suggestion to attack with only two of his seven battalions in a misguided attempt to conserve lives. Bryn Hammond attributes Harper's failure to take Flesquieres to a strong German defence, to the holding back of his reserve brigade, and partly to the overextended command and control structure (Harper had sited his HQ too far back, 8,000 yards (over 4.5 miles) behind the original British front line, and 7 miles from Flesquieres). Brigadier-General Hardress-Lloyd (GOC 3 Tank Brigade) thought Harper "an old ass" and claimed (according to the May 1918 journals of J.F.C. Fuller) that he had expressed scepticism about the new tactics of infantry advancing in single file ("worms") and had remarked that they should advance in line as if "you were walking arm-in-arm with a girl". Hardress-Lloyd claimed to have retorted "if the late Oscar Wilde were walking with you, where do you think he would go?” and that Harper almost had to be "carried from the room in an ambulance". Corps Commander Harper was promoted to GOC IV Corps on 11 March 1918, as part of a reshuffle in which a number of older corps commanders were retired from front-line command. He held this command, part of British Third Army, until the end of the