"Keep your fire on the causeway," shouted John, who then called to some of the men in reserve to mount the wall and fling stones on the men trying to clamber up. A second volley from either side crashed into the negroes racing towards the fort. Only two of them got across. Those behind who had not been struck down came to a sudden halt, only to be pushed on by those surging in the rear. The result was that a score of unhurt negroes were hustled into the water. John forbore to fire at these, but as soon as his men had reloaded, sent another volley among those who were still running along. Meanwhile the defenders of the wall had beaten off the assault of the men below, who were at a hopeless disadvantage. Two or three fell groaning to the ground, transfixed with spears; the rest leapt into the pool, and struck out frantically for the shore. The sight of this retreat, and a fourth volley from their unseen enemy, shattered the confidence of the bravest negroes. There was wild confusion on the causeway. Those upon it could not retreat because of the pressure of their comrades behind. They jumped into the water on both sides. The others, seeing that all was lost, fled back towards the wood. In ten minutes after the first attack they were in full flight.
But at this moment a shout was raised that the enemy were attacking from the other side of the island. Ferrier instantly sprang down from his perch, and calling on his men to follow him, rushed across the enclosure to repel this new assault. John, perforce confined to his post, ordered his company to join the others, while he alone kept watch on the causeway. Being undisturbed, he had leisure to consider what the enemy's plan had been. He could not doubt that they had arranged in their council of war that the Swahilis with their party should cross the river and creep under cover of the trees and scrub to the western shore of the pool. The intention had certainly been that the attack should be made on both sides of the fort simultaneously. If it had been perfectly timed, and begun at a concerted signal, the plight of the garrison might have been very serious. But careful co-operation is impossible to the negro. The men on the eastern side had rushed blindly to the assault, heedless of what the other party was doing. These, led by Juma himself, had made their way unobserved to the place arranged, and swum the pool under cover of the fringe of trees which were still left standing. But only one or two had landed when they heard the din of fighting on the other side. Juma, more intelligent than the negroes, had seen at once the necessity of striking while the garrison was engaged in that quarter. But he was compelled to wait until he had sufficient support, and by the time he had gathered a score of men about him the eastern attack was beaten off, and the defenders were hurrying to meet him.