Suddenly they were startled beyond measure by a tremendous screech and flutter which arose from right under their very noses. In their amazement and alarm they sprang back a couple of feet into deep water with a splash, and then saw, or rather heard, a flock of frightened ducks rise with a whirr and cackle from the bank and fly above their heads round the angle of the castle walls.
Deeply chagrined, the two young men crawled from the moat upon the bank and lay there listening intently. Such a mischance they had never dreamed of, and it seemed more than possible that it might have alarmed one of the guards and brought him to the spot to learn the cause of the birds' alarm. With deepest annoyance Edgar upbraided himself for not observing that a flock of half-wild ducks belonging to the castle had made a home on the bank he had counted upon in his plans.
For half an hour the two lay in the mud and water without stirring, listening with all their ears and gazing up at the outline of the top of the walls, which they could discern dimly against the sky. But the peering figures of the sentinels that they half-expected to appear never came.
"All is well after all, I think, Peter," said Edgar at last. "That was a bad start indeed, and had I not thought Sir John's need a most urgent one, I should have been tempted to try another night. But as 'tis, if any have marked the flutter and scare they have doubtless thought them due to winged enemies of the wild fowl, and not to those with intent to disturb the peace of the castle. Now let us try the powers of the line and grapnel we obtained after so much time and trouble. 'Twould be hard indeed to find them fail us now."
The outer walls were comparatively low, little more than twenty feet or so in height, and the throw of the grapnel was not a very difficult one. But it proved exceedingly difficult to obtain a lodgment with it. Time after time it was thrown with success well over the wall, but the darkness of the night forced them to fling it at random, and as soon as a strain was put upon it, down it fell again.
At last, however, it held fast even when the weight of both was tried upon it, and, overjoyed, Edgar instantly began to haul himself up hand over hand until he reached the top. Here he rested arms and shoulders on the wall while he paused a moment to listen. All was quiet, however, and drawing himself right up he signalled to Peter with the rope that all was clear for him to ascend in his turn.
In a few minutes both were safely on the wall, crouching in the deepest shadows they could find. The first stage of their enterprise had been successfully accomplished, and though cold and wet and shivering as with the ague, they felt elated that they were well on the way to the accomplishment of their formidable task.
"Draw up and coil the rope, Peter. We must take it with us, for doubtless we shall need it 'gainst our return."
Peter silently obeyed.
"Now follow me quietly, lad," and Edgar led the way softly along the wall, keeping well in the shadow, until they reached a narrow flight of stone steps that led down to the castle courtyard. Against them loomed the deep shadow of a corner turret, and, thinking that this might possibly be a likely place for a man-at-arms to be stationed on the watch, Edgar paused and listened intently.