The exact hour and the details of that movement we do not yet know. We do not know what loss the French sustained, we do not know whether any considerable bodies were cut off. We do not know even at what hour the French General Staff decided that the position was no longer tenable, and ordered the general retreat.
All we know is that, so far from being able to hold out two or three days against a numerical superiority of a third and under the buttress of Namur, the operative corner, with Namur fallen and, not 30 per cent., but something more like 130 per cent. superiority against it, began not the slow retreat that had been envisaged, but a retirement of the most rapid sort.
Such a retirement was essential if the cohesion of the Allied forces was to be maintained at all, and if the combined 4th and 5th French Armies and British contingent were to escape being surrounded or pierced.
By the Saturday night at latest the French retirement was ordered; by Sunday morning it was in full progress, and it was proceeding throughout the triangle of the Thierarche all that day.
But the rate of that retirement, corresponding to the pressure upon the French front, differed very much with varying sections of the line. It was heaviest, of course, in those advanced bodies which had lain just under Namur. It was least at the two ends of the bow, for the general movement was on to the line Maubeuge-Mezières. The farther one went east towards Maubeuge, the slower was the necessary movement, and to this cause of delay must be added the fact that von Kluck, coming round by the extreme German line, had farthest to go, and arrived latest against the line of the Allies.
Therefore the British contingent at the western extreme of the Allied line felt the shock latest of all, and all that Sunday morning the British were still occupied in taking up their positions. They had arrived but just in time for what was to follow.
It was not till the early afternoon of the Sunday that contact was first taken seriously between Sir John French and von Kluck. At that moment the British commander believed, both from a general and erroneous judgment which the French command had tendered him and from his own air work, that he had in front of him one and a half or at the most two army corps; and though the force, as we shall see in a moment, was far larger, its magnitude did not appear as the afternoon wore on. Full contact was established perhaps between three and four, by which hour the pressure was beginning to be severely felt, and upon the extreme right of the line it had already been necessary to take up defensive positions a little behind those established in the morning. But by five o'clock, with more than two good hours of daylight before it, the British command, though perhaps already doubtful whether the advancing masses of the enemy did not stand for more men, and especially for more guns than had been expected, was well holding its own, when all its dispositions were abruptly changed by an unexpected piece of news.
It was at this moment in the afternoon—that is, about five o'clock—that the French General Staff communicated to Sir John French information bearing two widely different characteristics: the first that it came late; the second that had it not come when it did, the whole army, French as well as British, would have been turned.
The first piece of information, far too belated, was the news that Namur had fallen, and that the enemy had been in possession of the bridge-heads over the Sambre and the Meuse since the preceding day, Saturday. Consequent upon this, the enemy had been able to effect the passage of the Sambre, not only in Namur itself, but in its immediate neighbourhood, and, such passages once secured, it was but a question of time for the whole line to fall into the enemy's hands. When superior numbers have passed one end of an obstacle it is obvious that the rest of the obstacle gradually becomes useless.[3] At what hour the French knew that they had to retire, we have not been told. As we have seen, the enemy was right within Namur on the early afternoon of Saturday, the 22nd, and it is to be presumed that the French retirement was in full swing by the Sunday morning, in which case the British contingent, which this retirement left in peril upon the western extreme of the line, ought to have been warned many hours before five o'clock in the afternoon.
To what the delay was due we are again as yet in ignorance, but probably to the confusion into which the unexpected fall of Namur and the equally unexpected strength of the enemy beyond the Sambre and the Meuse had thrown the French General Staff.