Selecting fifteen of his steadiest riflemen, including Makoko and Lepoko, Jack had them lowered one by one into the gully, and then himself followed. The night was fortunately very dark; all the flames from the barrels had gone out, and he trusted that the enemy would be quite unprepared for any movement from the fort. When all were assembled, they crept up the gully in dead silence, walking as far from the water as the steep sides allowed, so as to avoid kicking stones into it and making a splash. At first the gully was at least twelve feet deep, but it became more shallow as they proceeded, until by and by its top barely rose above their heads.
They had not gone far when they heard laughing and talking beyond them. However Elbel might regard his defeat, it had evidently not affected the spirits of his men; the negro's cheerfulness is hard to quench. At a bend in the stream, out of sight from the fort, shone the faint glow of the camp fire; and Jack, peeping cautiously round, saw a sentry on each bank, moving backwards and forwards, but stopping now and again to exchange pleasantries, or more often fatuous remarks about food, with the rest of the picket at the fire. It was nothing new to Jack that the Congo soldier's idea of sentry-go is somewhat loose.
Again Jack was favoured by circumstances. The glow of the fire did not extend far into the darkness of the gully; the noise of the laughing and talking was loud enough to drown all slight sounds for some distance around. Thus the sixteen men in the gully could approach very near the camp fire without being seen or heard. Jack's plan, already half formed before he started, was quickly adapted to the conditions. Silently gathering his men together, he ordered them in a whisper to follow him in a charge with the bayonet; not to fire except at the word of command; not in their pursuit of the enemy to go beyond the camp fire. It would have been easy to dispose of at least a third of the picket by firing upon them from the darkness; the distance was only about a hundred yards, and every shot would tell, for they were huddled together. Such an act would be justified by all the rules of warfare. Jack knew that in a like case he would receive no mercy from the enemy; but he was too young a campaigner to deal with them as they would deal with him; he could not give the order to shoot them down unawares.
When his men clearly understood what was required of them he led the way, and they all crept forward again. The glow of the fire now made them dimly visible to one another, but not to the picket, who were in the full light, nor to the sentries, whose attention was largely taken up by the proceedings of their comrades. When the sound of talking lulled for a few moments, Jack halted; when it grew in force, and he heard the sentries join in the chatter, he seized the opportunity to steal forward a few yards more. So by slow degrees they approached within forty paces.
To go further without discovery seemed to Jack impossible. Pausing for a moment to whisper once more to his men, he suddenly shouted the order to charge, and, springing up the bank, dashed forward with a cheer that was reinforced by the yells from fifteen lusty throats. The sounds of joviality about the camp fire died on the instant; the cheer from the river, echoed by the rocky walls of the gully, seemed to come from a host of men. Yells of alarm broke from the dusky figures by the fire. Some of the men seemed for the moment spellbound; others leapt to their feet and made a dash for the rifles stacked close by, tumbling over one another in their agitation; the majority simply scurried away like hares into the darkness, only anxious to get as far away as possible from this shouting host that had sprung as it were out of nothingness. As Jack's men rushed up there were a few reports of rifles hastily shot off, and eight or nine men made as if to stand firm near the camp fire; but they could not face the steel gleaming red in the glow. One or two hapless wretches were bayonetted before they had time to run; the rest, with a wild howl, flung down their weapons and bolted.
The sound of the conflict, Jack knew, would be taken by Barney as the signal to begin work outside the blockhouses. What would be its effect on the enemy? Would it draw their pickets on the right and left to the support of their comrades? Or would they be so much alarmed that nothing but flight would occur to them? He thought the probabilities favoured the former, for the firing having ceased, the immediate cause of alarm would seem to have been removed. Without staying to consider that the chain of investment would be broken by their action, the outer pickets would in all likelihood move towards each other for mutual support.
Here was an opportunity which Jack was quick to seize. Without a moment's loss of time, he called his men together and hurried back down the gully, where he ordered them to line the banks on both sides, keeping well in shadow from the light of the fire. The position they took up was about forty yards below the bivouac, almost the same spot from which the charge had been made. The men had only just established themselves when the picket from the eastern quarter came running up. Jack's situation was now so serious that he had no longer any compunction. As the negroes emerged from the gloom into the light of the camp fire, he ordered his men on the opposite bank to shoot. Several of the enemy fell; the rest turned tail, finding their comrades falling about them without being able to see their assailants. But they did not run far; when they had passed beyond the circle of light they halted.
Meanwhile all was quiet from the direction of the other picket beyond the gully. If this was advancing, it was with more caution. For some minutes no sound was heard; then on his left hand Lepoko detected a slight rustle in the brushwood, and he whispered to Jack that the enemy were creeping forward, feeling their way. At the same time there were sounds of movement on the right.
Now was the chance to attempt a ruse. Withdrawing his men stealthily down the stream for a hundred yards, Jack halted. The camp fire was dying down for want of fresh fuel; he hoped that the two parties would mistake each other in the gloom. A quarter of an hour passed. Then the air rang with shots and shouts; the two pickets had met and come into conflict. The error was soon discovered, and then there arose a terrific clamour as each party accused the other.
Jack considered that the work of the fort should have been completed by this time, all danger of interruption by the pickets having been removed by his sortie. He therefore led his men back along the gully, and arrived to find Barney putting the finishing touches to the work by the light of his bamboo lantern.