A strong wall and bastions, with a broad moat and outworks, and forts on the surrounding heights, give the city an appearance of great strength.
The duchy of Warsaw and the fortress of Danzig formed new outworks of his power and enabled him to overawe Russia.
The long straight lines of works which stretched to the plateau of the Michelsberg and formed the outworks of the main fortress on the left bank of the Danube were purchased in 1900 by the municipal authorities, in order to be levelled and laid out in streets for the extension of the town in this direction.
The old outworks have been partly demolished and replaced by modern forts, while suburbs have grown up round the inner walls and bastions.
By his orders castles were built at the mouth of the Don and on the bank of the Dnieper, outworks against the ever-aggressive Tatars, as well as on either shore of the Dardanelles.
At the same time the ancient graveyards round the city were swept smooth and levelled; obstructions were demolished, outworks constructed, and the defences generally renovated.
Eastward, within 2 m., there are two great British camps: Battlesbury, almost impregnable save on the north, where its entrenchments are double; and Scratchbury, a line of outworks encircling an area of some 40 acres, with three entrances and a citadel in the midst.
In circumference, and the fort can only be approached by steep and very roughly paved planes, commanded by the fort and the outworks, and by the hill to the west.
Unlike Java, Sumatra has a series of considerable islands (Nias Islands, Mentawi Islands, &c.) arranged like outworks in front of the west coast, which faces the open Indian Ocean.
Apart from the outworks, the castle forms an irregular square with round towers at the angles, the principal buildings being grouped round a central courtyard, the entrance to which is from the south through a series of gateways.
Kehl, the tete-de-pont of Strassburg, and several villages are included within this enceinte, and three of the outworks lie on the right bank of the Rhine, in the territory of Baden.
From Galatz to Focshani, and intended to cover an army of defence against invaders from the north-east, and of the outworks which make Bucharest the largest fortified camp in the world, except Paris.
On their advance to the outworks of the garrison the magazine of the fort exploded, whether by accident or design, killing many of the invaders.