18.

Expedition of Prince Koudacheff, 273.
to the Crimea, details of, 387-389.

Expeditions, assistance of fleets in, 174.
distant, 169.
marine, in modern times, 249.
maritime, 361-390.
of the ancients, 248.
of the Middle Ages, 171.
partly on land, partly by sea, 173.

Extended movements, when dangerous, 204.

Exterior lines of operations, 102.

Extermination, wars of, 34.

Eylau, 305, 306, 318, 352.
French armament at, 47.
Napoleon's march on, 94.
Napoleon's order of battle at, 198.
Russian artillery reserve at, 289.
Russian order at, 295.

F.

Famous retreats, instances of, 233.

Field, strategic, of 1806, 113.

Field-works, directions for attack of, 211, 212.
instances of well-arranged assaults on, 212.

Final reserves, 203.

Financial considerations, 50.

Fire-arms, influence of improvements in, on war, 347, 355, 359.

Fire-signals, how used, 276.

Flank attack, 203.
attack, cavalry, 310.
charges of cavalry, 307.
marches, 139, 140.
marches, where inadmissible, 140.
tactical maneuver by, 140.

Flanks of companies, movement by, 300, 301.
protection of, in tactical positions, 182.

Fleets, assistance of, in expeditions, 174.

Fleurus, 136, 193, 200.
balloons used at, 275.
order of battle at, 192.

Foot-artillery in line of battle, 289.
in the offensive, 316.

Forests, advantages of, in retreats, 183.

Formation by divisions, when preferable, 286.
for attack at Turin, 213.
for battle in small columns, 350.
for battle, Napoleon's system, 278, 279.
for battle often determined by size of army, 285.
for battle, Prussian and Austrian system, 354.
for close attack, 301.
of infantry for attack, five methods of, 292.
in two ranks, 356.
of troops for battle, 347-350.

Formations of cavalry, 309-311.
of lines of battle for two infantry corps, 282-284.
various, for infantry, 285.

Fortification of Coblentz, 157, 158.

Fortifications, remark upon, 151.

Fortified camps, 154.
places, attack of, 210.
places on the sea-coast, importance of, 152.
places, when a misfortune, 152.

Fortresses at Mayence, 150.
greatest advantages of, 150.
large, when preferable, 150.
number and position of, 149.
of France and Austria, 149.
on frontiers, 148.
relation of, to strategy, 148, 150.

Forts in a mountainous country, 151.
purposes of, 146.

Fossano, battle of, 168.

Four-rank formation of infant