Nigel clapped his hands with joy. “’Fore God!” he cried. “It is a most noble plan! But alas! Simon, I see not how we can tell the course of this passage or where we should dig.”

“I have peasants yonder with spades,” said Simon. “There are two of my friends, Harding of Barnstable and West-country John who are waiting for us with their gear. If you will come to lead us, Squire Nigel, we are ready to venture our bodies in the attempt.”

What would Knolles say in case they failed? The thought flashed through Nigel’s mind, but another came swiftly behind it. He would not venture further unless he found hopes of success. And if he did venture further he would put his life upon it. Giving that, he made amends for all errors. And if on the other hand success crowned their efforts, then Knolles would forgive his failure at the gateway. A minute later, every doubt banished from his mind, he was making his way through the darkness under the guidance of Black Simon.

Outside the camp the two other men-at-arms were waiting for them, and the four advanced together. Presently a little group of figures loomed up in the darkness. It was a cloudy night, and a thin rain was falling which obscured both the castle and the fort; but a stone had been placed by Simon in the daytime which assured that they were between the two.

“Is blind Andreas there?” asked Simon.

“Yes, kind sir, I am here,” said a voice.

“This man,” said Simon, “was once rich and of good repute, but he was beggared by this robber lord, who afterwards put out his eyes so that he has lived for many years in darkness at the charity of others.”

“How can he help us in our enterprise if he be indeed blind?” asked Nigel.

“It is for that very reason, fair lord, that he can be of greater service than any other man,” Simon answered; “for it often happens that when a man has lost a sense the good God will strengthen those that remain. Hence it is that Andreas has such ears that he can hear the sap in the trees or the cheep of the mouse in its burrow. He has come to help us to find the tunnel.”

“And I have found it,” said the blind man proudly. “Here I have placed my staff upon the line of it. Twice as I lay there with my ear to the ground I have heard footsteps pass beneath me.”