To the right of the 4th French Army were the 3rd and 2nd French Armies, opposing those of the Crown Prince and the Bavarians. The left of the Crown Prince's army was in touch with the outer forts of Verdun, and was attacking Fort Troyon, the first of the forts along the heights of the Meuse between Verdun and Toul. The little garrison was in dire straits, and was about to surrender when the French movement which I am about to describe began. General Joffre sent orders that the French 3rd and 2nd Armies were to move to the west against the Germans operating between the Upper Meuse and the Upper Aisne. The orders were carried out, and the French artillery won a great success. No less than eleven batteries of the Germans were destroyed. There was fiercer fighting on the 10th; but the French made progress, and on the 11th advanced still farther. A wedge had been thrust in between the Crown Prince and the Bavarians, and the Crown Prince was bound to retreat. This meant the salvation of Fort Troyon. It had been bombarded for five days. Most of its guns were out of action, and the forty-four survivors of the garrison were huddled in the bomb-proof shelters of the central works, when suddenly the German guns ceased firing and French cheering was heard. The fort was saved at the very moment when all hope seemed to have vanished. Before I conclude the story of the battle of the Marne I must say something about the 2nd French Army, which was facing the Bavarian army in Lorraine. The French army was drawn up across a gap in the Vosges Mountains known as the Gap of Nancy,[111] and its object was to hold back the Bavarians, so that they could not attack the right flank of the Allies. A second French force was now moved into Lorraine, and it took up a position to the south-east of the army holding the Gap. The commander of the 2nd Army erected very strong field works on the heights in front of Nancy, and from the 23rd of August onwards gallantly held his own. On the 6th September the fiercest of fighting began. The Kaiser himself came into the field, and by his presence and his speeches urged on the Bavarians to a desperate assault. For three days the battle raged without ceasing. The Bavarian troops were thought to be second to none in the German army, and their White Cuirassiers were amongst the flower of German cavalry. On the 7th the Kaiser took up a position on a neighbouring hill, and watched the attack which was to overwhelm the French. He had made ready to enter Nancy in triumph that evening.