 There was some uncertainty over the role of the army, Kiggell, the BEF Chief of Staff writing on 4 June, "The area in which the Reserve Corps (sic) may be employed must be dependent on events and cannot be foreseen".Gough was told to train the cavalry in the all-arms concept and to convince cavalry officers of the effectiveness of cavalry, when co-operating with artillery and infantry.In 1996, Badsey wrote that the Reserve Army was organised as a "conveyor belt", to exploit the success of the Fourth Army, with the 25th Division first, followed by two cavalry divisions and then the II Corps infantry divisions.