Just at this moment, while he was still on the floor of the cage, a high-velocity shell came by. With its flat trajectory it passed just overhead, swept the dome of the cage clean out of existence, and whizzed onwards to explode, with a curious grunting crash, some hundreds of yards beyond. The eagle looked up and gazed for some seconds before realizing that his prison was no longer a prison. The path was clear above him to the free spaces of the air. But he was in no unseemly haste. His eye measured accurately the width of the exit, and saw that it was awkwardly narrow for his great spread of wing. He could not essay it directly from the ground, his quarters being too straitened for free flight. Hopping upwards from limb to limb of the roosting-tree, he regained the topmost perch, and found that, though split by a stray splinter of the cage, it was still able to bear his weight. From this point he sprang straight upwards, with one beat of his wings. But the wing-tips struck violently against each side of the opening, and he was thrown back with such force that only by a furious flopping and struggle could he regain his footing on the perch. After this unexpected rebuff he sat quiet for perhaps half a minute, staring fixedly at the exit. He was not going to fail again through misjudgment. The straight top of the roosting-tree extended for about three feet above his perch, but this extension being of no use to him, he had never paid any heed to it hitherto. Now, however, he marked it with new interest. It was close below the hole in the roof. He flopped up to it, balanced himself for a second, and once more sprang for the opening, but this time with a short, convulsive beat of wings only half spread. The leap carried him almost through, but not far enough for him to get another stroke of his wings. Clutching out wildly with stretched talons, he succeeded in catching the end of a broken bar. Desperately he clung to it, resisting the natural impulse to help himself by flapping his wings. Reaching out with his beak, he gripped another bar, and so steadied himself till he could gain a foothold with both talons. Then slowly, like a dog getting over a wall, he dragged himself forth, and stood at last free on the outer side of the bars which had been so long his prison.