Besides the towers already named, the outer ward was additionally secured against any attempts at surprise by several cross-walls, "G," with gates, which subdivided it into several independent sections; so that, were any one gate forced, the assailants would only obtain possession of a small courtyard, in which they could be attacked in flank and front, and be overwhelmed by missiles from the curtain walls and towers. All these have long been removed, but their sites will be found marked upon the plan. The two posterns in the north wall of the inner ward against the Devilin and Martin towers, "c" and "g," were not made till 1681. In spite of all these multiplied means of defence, the Tower was once surprised by a mob in 1381, on which occasion Simon of Sudbury, Archbishop of Canterbury, and Sir Robert Hales, the Treasurer, whom they found in the chapel, were dragged to instant execution by these lawless miscreants, but it is possible that the way was paved by some treachery on the part of those in charge of the gates. Though subjected to various sieges, the Tower was only once surrendered, after the one in 1460. In 1263 two posterns were made for the service of the palace. One of these was undoubtedly the Cradle tower, "K"; the other may have been that of the Byward tower, "H," subsequently rebuilt about the time of Richard II. In 1267 the Papal Legate, Cardinal Ottobon, took refuge in the tower, which was promptly besieged by the Earl of Gloucester. According to the _Chronicle_ of T. Wykes, "the King threw reinforcements into the fortress, and brought out the Legate by the south postern," which can only have been one of the two posterns before mentioned, or that of the Iron Gate tower, "N," which then gave upon the open country without the city walls. To return to the records. In 1240 the King directed the keepers of the works at the Tower to repair all the _glass_ windows of St. John's Chapel, also those of the great chamber towards the Thames, "J," and to make a great round turret in one corner of the said chamber, so that the drain from it may descend to the Thames, and to make a new cowl on the top of the kitchen of the great tower (the keep?).[41]