Northumberland, Henry Percy, third Earl of, [99]; slain at Towton, [103].

Northumberland, Henry Percy, fourth Earl of, [164], [165].

Northumberland, John Neville Earl of (for a short period), afterwards Marquis Montague, [27], [110], [118] (note); slain at Barnet, [208].

O.

Offenham Ferry, near Evesham, [203].

Ordnance, Clerk of the, [223], [225].

Ordnance, Master of the, in the reign of Henry V., Edward IV., and Richard III., [219], [223], [241].

Ordnance, occasional use of, by the English, in sieges, in the fourteenth century, [218] to [216].

Ordnance commonly used by the English in war in the 15th century, [217] to [244].

Ormonde, Sir John, [106].