A glance at this diagram shows you that when he was marching in this oblique direction his right was exposed to attack from the armies on the Allied left--the French 5th Army, the British Army, and the new 6th Army issuing from Paris. If the British attacked him during this march, his columns could offer no effective resistance until they deployed and faced the British line, and while doing so they would be sure to suffer greatly. If they did not deploy, the 5th French Army could attack them in front; and if they did deploy, they would then have that army on their left flank. Meanwhile the new 6th French Army, by crossing the Ourcq, could cut off the German line of retreat. It was a most dangerous move, as you can easily see, and even now we wonder why von Kluck made it. There is little doubt that he believed the British and the 5th French Army to be so weary and dispirited that they were of no account. Von Kluck seems to have had some inkling that there was a new French force on his flank, for on 4th September he placed a flank guard along the Ourcq; but he does not seem to have known how strong this French force was. Next day (5th September), when he was across the Marne, he learnt the truth: the surprise army lay west of Meaux, and was marching on the Ourcq. On the 8th he realized his danger, and sent back two of his army corps to meet it. This, of course, weakened his advancing columns. Soon he found himself in an almost hopeless position: he was in hourly peril of being enveloped. This is what I meant when I said that he had thrust his head into the lion's jaws. [Illustration: Von Kluck's Artillery passing through a French village on its march towards Paris. _Photo, Topical Press._] * * * * * The fighting began at dawn on Sunday, 6th September, when the whole Allied line from Paris to Verdun was set in motion. We will first give our attention to the surprise army, which on that tropically hot day was slowly moving towards the western bank of the Ourcq, across the low plateau which rises to the north of the little town of Meaux. It was a smiling country through which the soldiers passed--the roads lined with tall poplars, the fields golden with ripe wheat, and the orchards heavy with fruit. The many villages on the tableland were in the hands of German outposts, and the main body lay on the eastern bank of the river, which here flows in a deep channel. The surprise army consisted of at least eight divisions. To meet it the Germans had five divisions. All day the French were engaged in hand-to-hand struggles with the German outposts in the villages, and were assailed by "Black Marias"[101] from the heavy German batteries beyond the river.