Following with wonderful promptitude the directions of Ivanhoe, and availing herself of the protection of the large ancient shield, which she placed against the lower part of the window, Rebecca, with tolerable security to herself, could witness part of what was passing without the castle, and report to Ivanhoe the preparations which the assailants were making for the storm. Indeed, the situation which she thus obtained was peculiarly favorable for this purpose, because being placed on an angle of the main building, Rebecca could not only see what passed beyond the precincts of the castle, but also commanded a view of the outwork likely to be the first object of the meditated assault. It was an exterior fortification of no great height or strength, intended to protect the postern-gate, through which Cedric had been recently dismissed by Front-de-Boeuf. The castle moat divided this species of barbican [Footnote: A barbican is a tower or outwork built to defend the entry to a castle or fortification.] from the rest of the fortress, so that, in case of its being taken, it was easy to cut off the communication with the main building, by withdrawing the temporary bridge. In the outwork was a sallyport [Footnote: A sallyport is an underground passage from the outer to the inner fortifications.] corresponding to the postern of the castle, and the whole was surrounded by a strong palisade. Rebecca could observe, from the number of men placed for the defence of this post, that the besieged entertained apprehensions for its safety; and from the mustering of the assailants in a direction nearly opposite to the outwork, it seemed no less plain that it had been selected as a vulnerable point of attack. These appearances she hastily communicated to Ivanhoe, and added, "The skirts of the wood seem lined with archers, although only a few are advanced from its dark shadow." "Under what banner?" asked Ivanhoe. "Under no ensign of war which I can observe," answered Rebecca. "A singular novelty," muttered the knight, "to advance to storm such a castle without pennon or banner displayed! Seest thou who they be that act as leaders?" "A knight, clad in sable armor, is the most conspicuous," said the Jewess; "he alone is armed from head to heel, and seems to assume the direction of all around him." "What device does he bear on his shield?" replied Ivanhoe. "Something resembling a bar of iron, and a padlock painted blue on the black shield." "A fetterlock and shackle-bolt [Footnote: These are terms in heraldry. Ivanhoe means that, since he is a prisoner, fetters and shackles would be good device for his shield.] azure," said Ivanhoe; "I know not who may bear the device, but well I ween it might now be mine own. Canst thou not see the motto?" "Scarce the device itself at this distance," replied Rebecca; "but when the sun glances fair upon his shield it shows as I tell you." "Seem there no other leaders?" exclaimed the anxious inquirer.