The _Outer Ward_ is a strip of from 20 feet to 110 feet in breadth, which completely surrounds the inner ward, and is itself contained within the ditch, of which its wall forms the scarp. This wall, though generally, is not strictly, parallel to the inner curtain. Like it, its east and west faces are straight, and the north face has a salient angle near its centre. The river front is also bent, though slightly. On the south side this ward varies in breadth from 20 feet to 80 feet; on the east from 60 feet to 90 feet; on the west from 60 feet to 70 feet; and on the north, the salient of which is rather bolder than that behind it, and a little nearer to the east end, the breadth ranges from 90 feet to 110 feet. The lengths of the faces upon the ditch in the same order are, 750 feet, 580 feet, 460 feet, and 620 feet, being a girth of 800 yards. The wall has been so altered and strengthened by modern casemates, and so encrusted by buildings, that it is difficult to arrive at its original dimensions. The height varies from 15 feet to 20 feet inside, and is about 12 feet more to the bottom of the present ditch. The usual thickness is about 6 feet. On the river front the wall was only 10 feet high, and apparently only of moderate thickness. The north-east and north-west angles are capped by drum bastions, parts of circles of about 80 feet diameter. They are called Brass Mount and Legge’s Mount, probably from cavaliers once upon them. Legge’s Mount has the lesser projection, and seems to be solid. The lower part of its exterior wall looks as old as the adjacent curtains, but the upper part is new, and contains a casemate pierced for six guns. Brass Mount, that towards Little Tower Hill, is pierced by a well-stair from above and a cross gallery below. This leads from a door in the gorge to the middle of a circular gallery, vaulted in brick, which envelopes the bastion and has numerous loops for musketry, and others altered to suit small cannon. This gallery is probably an addition of the Tudor period, excavated within the old retaining walls. The salient between these two mounts has recently been capped by the north bastion, an additional and perfectly new work, being two-thirds of a circle of about 60 feet diameter, with flattened sides, and containing three tiers of casemates, each pierced for five guns. The only regular towers of the outer ward are upon the south front, where the ditch is narrow and the palace buildings were most exposed. These are five, Develin, Well, Cradle, St. Thomas’s, and Byward Tower.