On the night of 14th February, with eight men with picks and shovels, and five double sentries, he was sent to make a connection between the French and English outposts by means of rifle-pits. It was a pitch black night, and as yet Gordon did not know the trenches as well as he had known the earthworks at Woolwich Arsenal. He led his men, and, missing his way, nearly walked into the town filled with Russians. Turning back, they crept up the trenches to some caves which the English should have held, but found no sentries there. Taking one man with him, Gordon explored the caves. He feared that the Russians, finding them undefended, might have taken possession of them when darkness fell, but he found them empty. He then posted two sentries on the hill above the caves, and went back to post two others down below. No sooner did he and these two appear below than "Bang! bang!" went two rifles, and the bullets ripped up the ground at Gordon's feet. Off rushed the two men who were with him, and off scampered the eight sappers, thinking that the whole Russian army was at their heels. But all that had really happened was that the sentries on the hill above, seeing Gordon and his men coming stealthily out of the caves in the darkness, had taken them for Russians, and fired straight at them. The mischief did not end there. A Russian picket was stationed only 150 yards away, and the sound of the shots made them also send a shower of bullets, one of which hit a man on the breast, passed through his coats, grazed his ribs, and passed out again without hurting him. But no serious harm was done, and by working all night Gordon and his men carried out their orders. It was not long before Gordon learned so thoroughly all the ins and outs of the trenches that the darkest night made no difference to him. "Come with me after dark, and I will show you over the trenches," he said to a friend who had been away on sick leave, and who complained to him that he could not find his way about. "He drew me a very clear sketch of the lines," writes his friend, Sir Charles Stavely, "explained every nook and corner, and took me along outside our most advanced trench, the bouquets (volleys of small shells fired from mortars) and other missiles flying about us in, to me, a very unpleasant manner, he taking the matter remarkably coolly." Before many weeks were past, Gordon not only knew the trenches as well as any other officer or man there, but he knew more of the enemy's movements than did any other officer, old or young. He had "a special aptitude for war," says one general. "We used to send him to find out what new move the Russians were making."