The moon rose as we started on our way. The sky was clear, but a light, white mist had come up since sundown, and skimmed the ground, which looked as though it were covered with down. On this white background, the moon threw long shadows, and everything took on a fantastic air. Very soon I thought I saw Arab mounted sentries. As I came nearer I found they were tamarisks in flower. Presently I stopped short, for I thought I heard the cannon-shot signal. Wagner told me it was the sound of a horse galloping. We reached the fort and the commandant made his preparations. The place was very easy to defend, and our squadron would have been sufficient to hold back a considerable force. Complete solitude reigned on the other side of the river. After a pretty long wait, we heard the gallop of a horse, and soon an Arab came in sight mounted on a magnificent animal and riding towards us. By his straw hat crowned with ostrich plumes, and by his embroidered saddle from which hung a _gebira_ ornamented with coral and chased with gold flowers, we recognised that he was a chief; our guide told us it was Sidi-Lala himself. He was a fine-looking and well-built young man, who managed his horse admirably. He put it at a gallop, threw his long gun up in the air and caught it again, shouting at us unintelligible terms of defiance. The days of chivalry are over, and Wagner called for a gun to _take the marabout down a peg_, as he called it; but I objected, yet, so that it should not be said that the French refused to fight at close quarters with an Arab, I asked the commandant for leave to go through the ford and cross swords with Sidi-Lala. Permission was granted me, and I was soon over the river where the enemy's chief was trotting a little way off, and taking stock of things. Directly he saw I was across he ran upon me and aimed with his gun. "Take care!" cried Wagner. I am rarely afraid of a horseman's shot, and, after the tricks he had just played with it, I thought that Sidi-Lala's gun could not be in a condition to fire. And in fact he pulled the trigger when he was only three paces from me, but the gun missed fire, as I had expected. Soon he turned his horse round so rapidly that instead of planting my sabre in his breast I only caught his floating burnous. But I pressed him close, keeping him always on my right and beating him back, whether he was willing or not, towards the steep declivities which edged the river. He tried in vain to turn aside, but I pressed him closer and closer. After several moments of frantic effort, suddenly I saw his horse rear and the rider drew rein with both hands. Without stopping to ask myself why he made such a strange movement I was on him like a shot, and I pierced him with my blade, right in the centre of his back, my horse's hoof striking his left thigh at the same time. Man and horse disappeared, and my mare and I fell after them.