It was after ten o'clock when scouting cavalry were observed falling back. Then the distant sound of a gun was heard, and a few seconds later a shell burst some hundreds of yards behind the British lines. The British guns one by one roared into action. A cloud of smoke rose along the line of the woods in front from the bursting shrapnel, but nothing could be seen of the German gunners. The defending guns were also well concealed. Here and there, from observation points upon buildings and slag-heaps, the controllers of the batteries were able to indicate targets and register hits unseen by the gunners themselves. The fire grew warmer and warmer as fresh batteries dashed up and unlimbered on either side. The noise was horrible, but no enemy had been seen by the infantry, and little damage done. {65} But now an ill-omened bird flew over the British lines. Far aloft across the deep blue sky skimmed the dark Taube, curved, turned, and sailed northwards again. It had marked the shells bursting beyond the trenches. In an instant, by some devilish cantrip of signal or wireless, it had set the range right. A rain of shells roared and crashed along the lines of the shallow trenches. The injuries were not yet numerous, but they were inexpressibly ghastly. Men who had hardly seen worse than a cut finger in their lives gazed with horror at the gross mutilations around them. "One dared not look sideways," said one of them. Stretcher-bearers bent and heaved while wet, limp forms were hoisted upwards by their comrades. Officers gave short, sharp words of encouragement or advice. The minutes seemed very long, and still the shells came raining down. The men shoved the five-fold clips down into their magazines and waited with weary patience. A senior officer peering over the end of a trench leaned tensely forward and rested his glasses upon the grassy edge. "They're coming!" he whispered to his neighbour. It ran from lip to lip along the line of crouching men. Heads were poked up here and there above the line of broken earth. Soon, in spite of the crashing shells overhead, there was a fringe of peering faces. And there at last in front of them was the German enemy. After all the centuries, Briton and Teuton faced each other at last for the test of battle.