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.