“But you must carry the plan as well as the letter, and start before daybreak,” said the colonel.

“I am ready,” I replied. I set but little value upon my life, for, truth to tell, I was utterly reckless now Valerie was false to me.

In the grey hour before the dawn I left the camp. I had exchanged my scarlet trousers and gilt-braided tunic for a shapeless white burnouse, and about my head wore a haick, around which was twisted many yards of brown camel’s hair; my face had been effectually dyed a deep brown, I had assumed a flowing black beard, and my bare feet were thrust into rough slippers. Any one who had met the inoffensive Arab trader from El Biodh, would scarcely have suspected him to be an officer of the Chasseurs d’Afrique, and a well-known figure in drawing-rooms of the Avenue de Champs Elysées.

Mounted on a camel, with well-filled bags across my saddle, I rode slowly along, over the rough stony desert, eastward, guided only by the streak of yellow light that heralded the dawn.

Far away upon the horizon was a low range of hills, at the foot of which the Kel-Ahamellen were encamped.

I knew it was useless to evade passing through their lines by taking a circuitous route, and had decided that it would be safer to act boldly, and endeavour to pass through their headquarters.

For hours I rode wearily onward. The pitiless rays of the blazing sun beat down upon the loose, parched earth, and their reflection almost blinded me. Not a breath of wind cooled the atmosphere, but, on the contrary, the blasts which ever and anon blew over the Great Sahara, whirling up dense clouds of sand, were like whiffs of hot air from a furnace.

The sun travelled its course, and sank behind me with a blood-red, angry glare that bathed the desert and mountains with brilliant tints. By shading my eyes with my hands, I could now distinguish that I was approaching the settlement of the hostile tribe, and could make out their scattered tents.

As I looked, I saw four figures approaching. They grew nearer rapidly. Then I saw they were mounted Arabs, galloping with all speed towards me. They were standing in the stirrups in the manner peculiar to the Bedouins of the Great Desert, and, with their long rifles carried high above their heads and their white burnouses flowing behind, were bearing down upon me.

Drawing a long breath, I collected all the courage I possessed.