“There is no fear of their seeing us, unless we happen to run into the very arms of the sentry,” Hector said encouragingly; “we shall only have the moat to swim; and as, according to the plan, it is nothing like so wide as that we passed before, we shall have no trouble with it.”

“Ah! here it is,” Paolo groaned.

“Nonsense!” Hector said.  “One cold bath more or less makes no difference now.  There, give me your coat again, and I will take it over.”

The moat was indeed but some twelve yards across, and in two or three minutes Paolo stood shivering on the other side.

“The edge is not far from the wall, not much more than the breadth of the moat.  Give me the cord.”

A few steps and they reached the wall.  After two attempts the hook caught, and Hector climbed up.  He was looking back to watch Paolo when he was suddenly seized from behind, and a deep voice in Italian said, “If you move I will kill you.  Who are you?”

With a sudden effort Hector twisted himself round and seized the disengaged wrist of his opponent, which he doubted not held a dagger.  The man loosened his hold of his doublet and tried to grasp his neck, but Hector in a moment leapt forward and threw his arm round the man’s waist.  They wrestled backwards and forwards, but the soldier was a powerful man, and Hector found that he could not long retain a grasp of his wrist.  Suddenly he felt his antagonist collapse; the dagger dropped from his hand, the other arm relaxed its hold, and he fell a lifeless mass.

“Thank you, Paolo.  You were but just in time.  The fellow was too strong for me.  Now let us slip down the inside of the wall as quickly as possible.”

A minute later they both stood at the foot of the wall, the hook was shaken off, and they proceeded along the wall until they came to a street.

“It is not more than two or three hundred yards to the outer wall,” Hector whispered.

Whether there were sentinels or not in the street they knew not.  If so, they had withdrawn themselves into deep doorways to avoid the blinding snow, and the wind drowned the slight sound made by their feet on the soft snow.

In a short time they reached the outer wall, crept along it until they found the steps leading up, crossed it in safety, fixed their hook, and rapidly descended.  A run of fifty yards brought them to the edge of the river bank.

“We will try to find a boat,” Hector said.  “There are sure to be some along here.”

They walked across the dry bed of the river till they reached the water’s edge, and then followed this.  In a few minutes, to their delight, they came upon a boat.  The bow was hauled a few feet out of water, and a rope, doubtless attached to a heavy stone anchor, stretched from its bows.  This they cut, put their shoulders to the gunwale, and soon had her afloat.  Then they scrambled in, put the oars out cautiously, and began to row.  Both had had some practice at the exercise, and it was not long before the boat grounded on the opposite shore.