"While the airship has hooked it, eh?"

"Certain. It's getting a trifle lighter already, and she might be seen, which would be dangerous. Well now, it seems to me that we must do something pretty soon or we shall find ourselves in chokey. Look here, Alec, are you game to stand by the Commander while I go on a tour of inspection? The flash sent out by those two shells when they exploded gave me a rough idea of our surroundings. In any case I spotted a huge mosque away to our left, so I shall make over in that direction. I'll follow this wall, and when it comes to an end I'll take good care to get hold of something which will tell me I am on the right road when returning. Ah! Listen to that! Rifle fire, eh? Getting lighter outside the city and the pickets are having shots at one another. Or it is a real attack opening. Yes, there go the guns again."

This time the roar which came to their ears was, perhaps, not so loud, and it seemed probable that it emanated from the guns of the defenders. But whoever was responsible for the firing, the enemy ringing in the city lost no time in replying. For these were the days of strenuous fighting about the beleaguered city. The allies, consisting of the Bulgarians, the Servians, the Montenegrins, and the Greeks, had swept the Turks in all directions before them, till the former were within striking distance of Constantinople itself, while such important cities as Salonica had been captured. But Adrianople still held out beneath the command of Shukri Pasha, while Scutari also resisted the Montenegrins. It may be imagined therefore, that the presence of a strong force of Turks in Adrianople made it essential that the allies should detach an even stronger force to watch and hem in their enemy. For weeks the armies had, in fact, watched one another, passage out of the beleaguered city being impossible, while actual fighting was intermittent and confined to mere skirmishing. But now pour-parlers between the allies and the enemy had broken down. Terms for peace had been rejected by the Ottomans, and as a consequence the war had been resumed after an armistice of some weeks' duration. To force the Turks to accede to the terms demanded by the allies, Adrianople must be taken, even at a great cost, and it happened that the arrival of Andrew Provost and his friends had coincided with this period. Indeed, a furious bombardment of the city was to begin forthwith, shells were to pour into the streets and about the houses, while the encircling forts were to be rushed one by one, at huge cost to the allies and the Turks, and the siege pressed daily closer. Here, then, was an explanation of this beginning cannonade.

"Get down close to the wall," Dick called to his chum, as those answering guns opened and that same tell-tale shriek sounded in the distance. "Here come the shells. Hope they won't fall closer than formerly, for what has happened to the Commander may very well happen to us. Look out! Get down close. Wish to goodness there was a trench here in which we could shelter."

In spite of the fact that a huge shell had just whizzed overhead, Dick went scuttling along beside the wall on hands and knees in search of some shelter. And hardly three minutes had passed before he was back again close to Alec.

"There's a bit of a ditch close to the wall farther along there," he said hastily. "Let's carry the Commander there. Wait, though, till that beggar has passed us."

That beggar happened to be a shell whose advance they could hear, and every instant they expected it to pitch in the ground somewhere beyond them. But this time it failed to carry to such a distance, and landing with a thud some few yards behind the wall beside which they lay, it exploded with violence, almost smothering them with dirt and debris and tipping stones from the wall upon them. At once Dick and Alec took the Commander by his legs and arms and carried his unconscious figure away from this danger zone till they reached the ditch of which the former had spoken.

"Better be in the open for a while than in one of the houses," said Dick, panting after such exertion, and bending over his officer. "I dare say we could manage to discover a house that's deserted, for there are sure to be numbers left untenanted at such a time. But the danger would be greater there. If a shell happened to strike the place, and one were not killed by it, one would stand the chance of being buried alive in the ruins. Now, you're game to stick here and wait for a while?"

Of course Alec was game. He was getting quite accustomed to those falling shells now, for more guns were speaking in the distance, and shots were raining into the city. All he feared really was discovery, and when he came to think of it the risk at present was not so very great. Indeed, while there was darkness no one was likely to stumble upon them, and less so just then when the enemy were battering the place, and people had their attention fully engaged in looking after their own security. It was when daylight came that the real danger would arise, so that it was urgent that one of them should at once seek out a place which would provide a haven.