The Fourth Australian Division, from Corps Reserve, took over the French front, as far south as the Amiens—Roye road on August 2nd, and on the next night took over from the Second Australian Division all that part of its front which lay south of the railway, thus disposing itself upon what was ultimately to become the battle front of the Canadian Corps.
On the same night, the Second and Third Divisions, who had thus been left in sole occupation of the sector which was to be the Australian Corps battle front, carried out a readjustment of their own mutual boundary, which would place each of these two Divisions upon its own proper battle front.
On the night of August 4th, the Second and Third Divisions rearranged their defensive dispositions so that each of them deployed only a single Brigade for the passive defence of its front, and withdrew to its rear area its remaining two Brigades, who were thus afforded three clear days to complete their internal preparations.
The Canadian Corps commenced to arrive, and on August 4th two Canadian Brigades relieved two Brigades of the Fourth Division, thereby releasing them so that they also might commence to prepare for the battle. It was originally intended that the last Brigade of the Fourth Division should also be relieved by Canadians on August 6th, when an untoward incident happened, which caused considerable alarm and speculation; and it led to a modification of this part of the plan.
The 13th Australian Brigade (of the Fourth Division) was on August 4th spread out upon a front of over six thousand yards. It had no option but to leave the greater part of the front-line trenches unoccupied, and to defend its area with a series of small, but isolated, posts. On that night, one of these posts, in the vicinity of the road to Roye,[15] was raided by the enemy, and the whole of its occupants, comprising a sergeant and four or five men, were surrounded and taken prisoner.
It was an unusual display of enterprise on the part of the enemy, at this point of time and in this locality. Whether it had been inspired by sneering criticisms from behind his line of the nature which have been quoted, or whether signs of unusual movement or a changed attitude on the part of our trench garrison had instigated a suspicion that something was happening which required investigation, could only be surmised. But the fact remained that five Australians had been taken, at a place several miles south of the southernmost point hitherto occupied by "the English."
The side-stepping of the Australian Corps southwards had thereby become known to the enemy, and it was necessary to estimate the deductions which he would be likely to draw from that discovery. Much depended upon the behaviour of these prisoners. Would they talk? and, if so, what did they know? That Australian captives would not volunteer information likely to imperil the lives of their comrades, might be taken for granted, but German Intelligence Officers had means at their disposal to draw from prisoners, unwittingly, anything they might know.
We could only hope, under the circumstances, that these men really did know nothing of our intention to attack; and that, if they had become aware of the presence of Canadian troops in the rear areas, they would believe the story which we had sedulously spread, that the Canadians were merely coming to relieve the Australian Corps, so that it might have a long rest after its heroic labours.
Not many weeks afterwards it was my good fortune to capture a German Headquarters, in which were found Intelligence Reports containing a narrative of this very incident. The importance of the capture of these men had been recognized, and they had been taken far behind the lines for an exhaustive examination. But, despite all efforts of the German Intelligence Staff, they had refused to disclose anything whatever but their names and units—which they were bound to do under the rules of war. The report went on to praise their soldierly bearing and loyal reticence, and held up these brave Australians as a model to be followed by their own men, adding that such a demeanour could only earn the respect of an enemy.