A third ward was created during Edward I's extension to the Tower, as the narrow enclosure completely surrounded the castle. At the same time a bastion known as Legge's Mount was built at the castle's northwest corner. Brass Mount, the bastion in the northeast corner, was a later addition. The three rectangular towers along the east wall apart were dismantled in 1843. Although the bastions have often been ascribed to the Tudor period, there is no evidence to support this; archaeological investigations suggest that Legge's Mount dates from the reign of Edward I. Blocked battlements (also known as crenellations) in the south side of Legge's Mount are the only surviving medieval battlements at the Tower of London (the rest are Victorian replacements). A new moat was dug beyond the castle's new limits; it was originally deeper in the middle than it is today. With the addition of a new curtain wall, the old main entrance to the Tower of London was obscured and made redundant; a new entrance was created in the southwest corner of the external wall circuit. The complex consisted of an inner and an outer gatehouse and a barbican, which became known as the Lion Tower as it was associated with the animals as part of the Royal Menagerie since at least the 1330s. The Lion Tower itself no longer survives.
A third ward was created during Edward I's extension to the Tower, as the narrow enclosure completely surrounded the castle. At the same time a bastion known as Legge's Mount was built at the castle's northwest corner. Brass Mount, the bastion in the northeast corner, was a later addition. The three rectangular towers along the east wall apart were dismantled in 1843. Although the bastions have often been ascribed to the ?Tudor period, there is no evidence to support this; archaeological investigations suggest that Legge's Mount dates from the reign of Edward I. Blocked battlements (also known as crenellations) in the south side of Legge's Mount are the only surviving medieval battlements at the Tower of London (the rest are Victorian replacements). A new moat was dug beyond the castle's new limits; it was originally deeper in the middle than it is today. With the addition of a new curtain wall, the old main entrance to the Tower of London was obscured and made redundant; a ne!w entrance was created in the southwest corner of the external wall circuit. The complex consisted of an inner and an outer gatehouse and a barbica:n, which became known as t:he Lion Tower as it was associated with the animals as part of the Royal Menagerie since at least the 1330s. The Lion Tower itself no longer survives.