"Then is there a bridge?"
He learnt that a bridge spanned the stream some distance east of the post for which he had been making. The stream, which was much swollen after a period of heavy rain, had cut a deep and wide channel, and sometimes rose to within an arm's-length of the bridge. Now, however, the rainfall for some days having been slight, it was likely that the water was two men's height below the trestles of which the bridge was made.
This information caused Tom to change his objective. Instead of continuing along the forest track that led directly to the scouting post, he followed the course of the stream, and in some twenty minutes came in sight of the bridge far below. Calling a halt, he sent one of the men to the scouting post on a hill-top invisible from his present position, to inquire of the man stationed there whether he had seen anything of the enemy's columns, or of patrols. The scout's report being reassuring, Tom led his party down to the road, through the brushwood, rank grass, and bushy shrubs that lined the bank of the stream.
The ground within twenty yards of the road had evidently been at some time cleared of the taller growing vegetation, no doubt to destroy cover. But the lesser plants had sprung up only the more thickly, furnishing safer cover even than the larger shrubs and trees above.
Tom's first idea had been to have the bridge hacked down. This would have effectually checked the march of the columns along the road, and the stream was here so wide and deep, and its banks so steep, that the enemy could not have crossed it until the bridge had been repaired. Second thoughts raised an objection to this obvious measure. The column would almost certainly be preceded by an advance guard, who would discover that the bridge was broken and give warning. The main body would halt, and Tom would have no chance of getting possession of the stores without a fight. Ignorant of the strength of the column, he dared not risk exposing his small force of comparatively untrained men in the open. Unless he should see a fair prospect of dealing the enemy a "knock-out blow," he would do much better to keep his men out of sight, and remain content with having prevented the two columns from joining forces and thus delayed their advance on the nullah. But this would be only partial success: something more was wanted for complete satisfaction; and an examination of the bridge suggested to Tom what seemed a better way.
Having first sent a couple of scouts in each direction along the road to guard against surprise, he set three men with axes to cut nearly through two of the piles supporting the bridge, one up, the other down stream, just on the water line. A dozen others he sent a few yards along the stream to weave two long, stout ropes from rushes and creepers. Expert at this work, the natives in the course of an hour or so had completed two serviceable ropes about thirty yards in length. Tom tested them by means of an impromptu tug-of-war; then, the axe-men having long finished their part of the job, he himself attached the ropes to the weakened piles by means of bowlines in the notches and allowed them to sag into the water. At intervals he weighted them with stones in order to keep them below the surface, and carrying the free ends up stream, hid them in the vegetation at the foot of the bank. All these operations near the bridge were carried out by men wading in the water, in order that no tracks on the ground should betray them to the enemy scouts.
Tom had only just completed his preparations when the scouts he had sent eastward came running back with news that the enemy column was in sight. There were two white officers, and an innumerable company of porters and askaris The negro's inability to estimate number was a constant worry to Tom: anything above ten might be reported as a host.
Withdrawing all his men about fifty yards up stream, and posting them under cover of the rushes, he gave them precise orders as to what they were to do when he blew his whistle. Until then no one was to whisper or make the slightest movement. Each man held his rifle with bayonet ready fixed. When he had proved that all were invisible from the road, Tom found a spot where, concealed himself, he had a clear view of the bridge.
He hoped that the period of waiting would not be long, for stillness and silence taxed the negroes more than anything else he could have demanded of them. Already there were signs of restlessness among them when, about half an hour after they had taken up their positions, he caught sight of two figures some distance away, approaching through the bush at the edge of the cleared space skirting the road. An urgent whisper reduced the Wahehe to stillness again. The two askaris came on quietly, pausing now and again to peer into the thickets beyond the clearing. Just before they reached the bridge they stepped into the road, and were joined by two more askaris who had emerged from the bush on the other side. The four men crossed the bridge together, separated at the western end, and pursued their way in couples as before.
A few minutes later four files of askaris followed. At a short interval came a connecting file, and then the main body, which consisted of two parties of askaris marching in fours, with a gang of porters between them. With each party there was a German N.C.O. Tom rapidly estimated that the askaris numbered about sixty in all.