There was no time for sentiment, however, this morning, for the next moment Dastral was startled by the sound of a machine-gun behind him:

"Rat--tat--tat!"

Yes, one of his own friends was already attacking the warplane. It sounded like Mac, and the tactics seemed suspiciously his, for he had been creeping up behind Dastral, following his leader, as he had so often done before, and he was now engaged in a battle royal with the monster, wilst another 'plane was tackling the second scout, though at a disadvantage.

For a second Dastral was halting which way to turn, but pilots have to make rapid decisions every day, and when he saw Mac's danger, for the enemy would assuredly send him down in a few minutes unless help came, the Flight-Commander banked quickly, and, still having the advantage of nearly a thousand feet in altitude, he swept on to help his man.

It was well he did, for though Mac fought bravely, as Dastral had taught him to do a score of times, he was no match for the huge German, with her armoured car, and two machine-gunners in addition to the pilot.

As Dastral swept back to his comrade, he saw the two machines raking each other, but though Mac got in several shots at the fuselage and the engines, he hit no vital part.

"Ye gods, what a huge brute she is!" ejaculated the Flight-Commander as he drew near, and sailed over the top of the monster, just seeking for some weak spot.

Before he could clamp in his drums he saw Mac's machine reel, and spin round once or twice, as though the controls had been broken by some questing bullets. The German continued to fire, however, and the next instant Dastral saw the reason of it all, for he saw Mac's observer stretching over towards the pilot.

"Heavens! The poor chap's hit!" he exclaimed. Then shouting almost fiercely, as though he fancied Mac could hear him, he cried:

"Never mind, they shall pay for it, Mac!"