It would be the business of the allies to try and force this line, either by carrying the central entrenchments across the gap or by turning the French left flank in the forest of Sars or the French right flank in the wood of Lanière, or by both of these attempts combined; for it must be remembered that the numerical superiority of the allies gave them a choice of action. Should either the stand on the left or that on the right be forced, the French line would be turned and the destruction of the army completed. Should the centre be pierced effectively and in time, the Northern half of the army so severed would certainly be destroyed, for there was no effective line of retreat; the Southern half might or might not escape towards the valley of the Sambre. In either case a decisive victory would destroy the last of the French bodies of defence and would open the way for an almost uninterrupted march upon Paris.
It will be self-evident to the reader that what with Villars' known methods, his dependence upon his engineers, the tradition of the French service in this respect, the inferior numbers of the French forces, and the glaring necessities of the position, earthworks would be a deciding factor in the result.
Now the value of entrenchment is a matter of time, and before proceeding to a description of the action we must, if we are to understand its result, appreciate how great an advantage was conferred upon the French by the delay in the attack of the allies.
As I have said, it was upon the morning of Monday, September 9th, that the two armies were drawn up facing each other, and there is no apparent reason why the assault should not have been delivered upon that day. Had it been delivered we can hardly doubt that a decisive defeat of the French would have resulted, that the way to Paris would have been thrown open, and that the ruin of the French monarchy would have immediately followed. As it was, no attack was delivered upon that Monday. The whole of Tuesday was allowed to pass without a movement. It was not until the Wednesday morning that the allies moved.
The problem of this delay is one which the historian must anxiously consider, for the answer to it explains the barrenness and political failure associated with the name of Malplaquet. But it is one which the historian will not succeed in answering unless indeed further documents should come to light. All that we now know is that in a council of war held upon the Monday on the side of the allies, it was thought well to wait until all the troops from Tournai should have come up (though these were few in number), and necessary to send 9000 men to hold the bridge across the Haine at St Ghislain in order to secure retreat in case of disaster.[10]