The enemy had crept up to within about three hundred yards of the tower. The next fifty yards of the track were exposed, then there was a break in the bank in which they could find cover among low boulders and stunted bushes. It was at this point that they would first come in sight of the wall surrounding the tower enclosure. Burton concluded that as their mission was urgent, they would not wait the arrival of their artillery, which no doubt they had sent for at the first alarm, but would dash along the exposed portions of the track, shelter themselves temporarily below the wall, and then endeavour to carry the position with a rush. The gateway was blocked by the cart, but the wall could easily be scaled, and the slender defences of the tower entrance would yield in a few minutes. It was of prime importance, therefore, that the enemy should be prevented from reaching the wall. The track was wide enough for four or five men to move abreast. By means of the machine-gun, Burton could mow the enemy down if they advanced in mass; but having very little ammunition for it, he had decided to use it only as a last resource. In the early stages of the impending action he must depend on rifle fire, and he realised that, with no more than three rifles, a great deal depended on the extent to which the enemy could be intimidated. Personally he was at a disadvantage in respect of his unfamiliarity with the Bulgarian rifle. Marco had explained to him the sighting arrangements, which were adjusted to the metre scale; but he recognised that his first shots would be experimental. At short range he could hardly fail of success. Some minutes passed; the enemy gave no sign of movement. "Keep your eye upon them, while I go and see how the prisoners are getting on with their work," said Burton to Marco. He went down to the cellar, observing on the way that Nuta had completed a large coil of the cotton rope. The Bulgar was staggering into the tunnel with the last of the boxes of dynamite. Hildenheim was donning his tunic, which he had stripped off for the sake of ease in working. From the coolness and the unsoiled appearance of Major Schwartzkopf, Burton inferred, with secret amusement, that that officer had not put himself to any exertion. "I zink I hear a shot, sir," said Hildenheim. "I thought so too," rejoined Burton. "But we are not engaged with your friends yet, and as I see that all the dynamite is removed, you are safe here--for the present." "So! I know ze Bulgar language. Ven our allies haf ze tower taken, I vill haf much pleasure to--vat you call it?" "Interpret for us? Thank you, captain. I am sure you are anxious to be useful."