The moment he saw them he started straight to meet them. Nothing could have been better calculated to assist his brother in the desperate struggle on the track. It was as when a charging bull is diverted from the object of his fury by the fluttering of a handkerchief or a newspaper within his range of vision. The Kalmuck airmen recognised that they had an opponent with whom they must seriously reckon; and though perhaps their general, looking on from below, would have bidden them to ignore the aeroplane, and pursue the more important duty of shattering the defences, they no doubt thought that a few minutes' or even hours' further delay would be less disastrous than the destruction of themselves and their machine. When the defenders' aeroplane was out of action, the rest would be easy.
Lawrence had resolved not to imitate the enemy in hurling a bomb while the machines were flashing past in opposite directions. His missiles were too precious for one to be wasted. As the aeroplanes met, he heard two cracks, followed by two metallic thuds on the iron plates below his chassis: the enemy had fired. What effect their shots had he knew not, but neither the engine nor the occupants suffered any injury. He had already commenced a turning movement. Completing his circle, he steered straight after the enemy, who were heading directly up the valley. There had been no explosion on the track or in the mine compounds as they passed: so far his tactics had justified themselves.
But Lawrence had not been more than a few seconds in pursuit before he found that in speed his machine was utterly outclassed. The enemy seemed almost to leave him standing. This was not unexpected; but as soon as he was sure of it he felt that his course of action was clearly marked out. It would be a fatal mistake to give the enemy enough air-room to take advantage of their superiority. If they got plenty of space for manoeuvring they could rise as far above him as they pleased, and either shatter the aeroplane with a well-placed bomb, or, having two rifles to one, could wait an opening for a shot that would incapacitate himself or Fazl, perhaps both. He must devote all his energy and skill to dodging and deluding the enemy, attacking them if occasion offered, in any case keeping them constantly employed. Their engine must consume a much larger quantity of petrol and lubricant than his. They must have used up a great deal in flying from their starting-place--Tash Kend, he presumed--and it was unlikely that there was any supply with the army at the end of the valley from which they could replenish their tanks. If he could only manoeuvre so as to starve them out of fuel, all their superiorities would be nullified and their usefulness would have vanished.
It was a question now of calculating chances, or rather of guessing--like the children's game when one brings his closed fists from behind his back and asks another to guess which hand holds the concealed object. When the two aeroplanes were out of sight, the occupants of neither could know what the others were doing. They could only make a random shot at the probabilities. Lawrence felt pretty sure that the enemy would seek to rise to a greater altitude than they supposed him to be attaining. He therefore decided to descend at once, and hover in the lower part of the valley. A long vol plané northward brought him within a short distance of the struggle going on at the bend. As he sped by, he ordered Fazl to drop a bomb among the enemy beyond the breastwork, then swooped past, three or four hundred feet above the river, turned at the first possible spot, and flew back to meet the enemy. As he expected, they had risen to a great height. Flying low as he now was, they were probably two thousand feet above him. When they saw him, they at once began to descend; but the machines were rushing in opposite directions so swiftly that the vertical distance between them was lessened by only two or three hundred feet when they met. A few seconds after they had passed, Lawrence heard two explosions, and Fazl reported that the enemy's bombs had fallen, one in the river, the other on the cliff-side. Again they had missed their aim.
Lawrence knew that they could not return within fifteen minutes. While it was important to him that they should waste their petrol, it was equally important that he should husband his, for he had very little left at the shed. It occurred to him that there would be time to alight on the platform, run to the mine to see how things were passing there, and get back in time to fly off before the enemy came in sight. He therefore wheeled round at his usual place, and in less than a minute slid gently on to the ledge. Leaving Fazl to look to the engine, he ran along the pathway, and on turning the corner saw with some astonishment that hostilities had apparently ceased. The breastwork was still manned by Bob and his party: Lawrence almost winced as he noticed how large a number of bodies lay prostrate around them. The enemy were invisible: it seemed certain that their attack had been repulsed.
The mine compounds were deserted, except by Gur Buksh and two other men, whom Lawrence recognised in a moment as Chunda Beg and Shan Tai. These three were reclining against the wall near the machine gun. Every other fighting man had crossed the bridge to bear his part in the holding of the track. Lawrence felt a thrill of pride in the courage and loyalty of the cook and the khansaman, who, house servants as they were, often held in scorn by the warriors, had in this hour of peril given their assistance to the steadfast havildar.
He hurried on to the compound, noting as he passed the havoc wrought by the one bomb from the hostile aeroplane which had hit the mark. Gur Buksh and the others saluted as gravely as if it were the prime of peace.
"What has happened?" asked Lawrence breathlessly.
The havildar related how the appearance of the enemy's aeroplane had been the signal for a more ferocious bombardment than had before taken place. When the breastwork was half ruined by the shells, a swarm of Kalmucks rushed to the attack with yells of anticipated triumph, while the defenders, who had remained in comparative safety some distance away, leapt back to their places at the shattered rampart. The enemy, coming unawares on the wire entanglements, had been thrown into an unwieldy and disordered mass; and after a few minutes of desperate efforts to break through the obstacle, with partial success, they had been so withered by the defenders' fire that flesh and blood could endure no more. They had fled, a confused rabble, to their own entrenchment.
There was no time for Lawrence to hear more, or to discuss with the imperturbable Sikh any measures that might be devised to assist the heroic fighters on the other bank. He knew well that the check could be only temporary, and could not think without distress of the issue of the next attack. Hurrying back to the ledge, he and Fazl got into their places, ready to fly off directly they heard the returning aeroplane. The Gurkha's ears first caught the throbbing drone, and as the machine once more rose into the air, the field guns recommenced to bark and spit.