"Where's your map?" asked the captain, after he had finished his meal. "Ah, there you are: no sign of the viaduct is shown. The thing's beastly inaccurate. See that slight river almost ahead? That's Nôtre Dame d'Huy. The railway line skirts the other side of the hill. There's a fairly broad valley between Nôtre Dame and the hill on the right. Both eminences are crossed with trenches, but they are not held. The Huns were clearing out as I slipped through. It's my belief that they have purposely retired in order to leave a tempting gap for our troops, and then they'll start shelling from both sides. However, it's too early for that, so we ought to get through and astride the railway line before they spot us." Captain Cludderborough spoke with such decision that his words carried conviction. With his aid there was certainly a good chance of pulling off a highly successful coup. By destroying the railway bridge the transference of German troops from the southern sectors of the line to the threatened regions would be seriously impeded. By the time the men were taken by a circuitous loop-line the British heavy guns would be in position ready to meet the expected counter-attack upon the village of Néancourt and the captured Von der Golz Redoubt. Steadily the Tank approached the gap between the two hills. So far all went well. Captain Cludderborough's statement that the Germans had abandoned the rising ground was evidently confirmed, for there were no signs of any living Huns. "Rummy sort of show, sir," commented Sergeant Alderhame, as the defence came in sight. "I should feel inclined to go smack bang over the hill instead of through that gap." "Eh?" interrupted the captain. "You would, would you? Not only would you have to surmount difficult ground, but you would be absolutely on the sky-line and a target for every German quickfirer within ten thousand yards." "Very good, sir," said the sergeant quietly. Having made his protest, he had done all he could in that direction. He was bound to obey unquestionably the decision of his superior officer, and since Setley agreed to the captain's remark the matter was settled. Nevertheless, Sergeant Alderhame's words impressed themselves upon Ralph's mind The subaltern decided that he would be unfeignedly glad when the Tank emerged from that forbidding valley. The very stillness, contrasting vividly with the rumble of the distant guns, seemed out of place. The defile was nearly three quarters of a mile in length, its width averaging only a hundred yards. On either side the ground rose with tolerable abruptness, the height of the encircling hills being considerably greater than it had appeared when viewed from a distance. Half-way to the summit a triple line of trenches encompassed both hills, but these were as silent as the tents of Sennacherib when the angel of death had passed through the Assyrian hosts.