Almost at the same instant, the shriek of a steam siren came from the far distance--from that big Turkish steamer which had so unexpectedly opposed the advance of this British party on the River Euphrates, and, following it, an answering shriek, more piercing in its intensity, from the steam-launch drifting but a few yards away from them. Then her bows appeared, to be followed in a little while by her funnel, and then by the whole length of her. There was foam at her stern, while smoke was blowing out from the top of her funnel, for she was under way again, and, indeed, was steering a course towards another island which dotted the marshes in the distance. Perched on a raised portion of the deck, just in front of her funnel, was a Turkish officer, shouting loud commands; while on the deck for'ard of him were gathered some twenty or more soldiers, all eager and expectant; yet, as it happened, their gaze was fixed on the distant island, and not upon the water beyond that from behind which they were just emerging. Thus it followed that more than a minute passed before one of them noticed the motor-boat stealing gently, bow on, towards them. The man started and shouted, lifting his rifle high over his head. "Look!" he shouted, so suddenly, and in such a voice of alarm, that the officer was startled. Swinging round, he too saw the motor-boat, and himself took up the shout with a vengeance. "The enemy! Swing the ship round! Fire into them!" he bellowed. "Steady lads!" cried Commander Houston, standing erect in his cabin. "Marsden, stop her! Now, boys, let 'em have it!" A volley burst from the weapons of the sailors in the motor-boat, and several of the Turks fell from the steam-launch and splashed into the water. By that time bullets were sweeping about the head of the Commander, while not a few struck the sides of the motor-boat or the surface of the water near at hand, throwing up spray which swept over the heads of those who manned her. But not a man flinched; while Commander Houston, snatching his pipe from between his teeth, roared encouragement at the sailors. "Let 'em have it!" he cried. "Now, Keith," he bellowed, swinging round to our hero, "put in your bullets as fast as you are able. Ah! That has dropped their officer. Just keep your eye on the man at the wheel, and the man who's running the engine, for we can't afford to allow that boat to get away from us." His teeth had gritted on the stem of his pipe a few seconds earlier, and, unseen by his men, the Commander clapped a hand to one shoulder. Perhaps it was a minute later that he wiped blood from his lips with his handkerchief, and then, like the old "sea-dog" he was, thrust his pipe back into his mouth and went on smoking, still careless of the bullets humming about him, his eyes fixed all the while upon the enemy.