The overhanging mass afforded complete shelter from the sun, while the broken ground in the rear would afford excellent cover in case they had to put a greater distance between them and the approaching convoy. "Bluejackets!" exclaimed Farnworth. "You're right," agreed Dick quietly. "Some of them are, at all events. This looks interesting." It took more than an hour for the convoy to get abreast of the place where the fugitives lay concealed. The column was headed by a dozen Turkish irregular cavalry, similar in appearance to those who had passed earlier in the day. Following them came a company of infantry, escorting a number of open wagons drawn by small, hardy-looking ponies. The wagons were heavily laden with tins of petrol. Following them were about fifty bluejackets, not of the Ottoman navy, but in the rig of the Imperial German navy. They were accompanied by five or six German officers in white-duck uniforms, all of them mounted. At some distance in the rear came six trucks each containing four large torpedoes, while the convoy terminated in another troop of Turkish horsemen. "Fishy, very fishy!" declared Crosthwaite after the column had passed. "Petrol and torpedoes." "Suggestive of submarines, sir," remarked Farnworth. "Exactly. Now the question is, where are those fellows taking that gear to? Even supposing the French had evacuated the district around Kum Kale, there would be no particular object in taking them there. A submarine could take in her stock of torpedoes at Constantinople, and be piloted through the mine-fields in The Narrows. They might be en route for Smyrna, but, since there is a railway available, it doesn't seem at all likely. Evidently a hostile submarine is operating outside." "A German?" hazarded Farnworth. "I hope not; but there is no saying what these fellows will be up to. Everything seems in their favour in that direction. They can torpedo our ships, and we have nothing afloat to go for in return. Still, in sinking their submarines we haven't done so badly, and I guess while we've been cooped up here our fellows have nabbed a few more. Anyway, it would be interesting to find out where those torpedoes are going. I vote we follow at a respectable distance until dusk, and then close on them a bit." "I'm game, sir," consented the midshipman. While daylight lasted they had no difficulty in following the trail. They were in luck's way, for they found a haversack containing some dates and half a loaf. The food, washed down by a little spring water, revived them considerably, the midshipman declaring that he felt "absolutely bucked". Towards sunset Dick gave the word for an increased speed, and before darkness set in they were within two hundred yards of the slowly-moving rear-guard. By dint of taking cover and advancing with the utmost caution they managed to keep in touch with the object of their investigations.