onducted, 16.
wars to reclaim rights, 16.

Oleg, expedition of, 867.

Open positions, 181.

Operations, base of, where to be established, 84.
bases of, definition of, 77.
how to be chosen, 79, 80.
plurality of, 78.
change of lines of, 118.
control of, 52.
divergent and convergent, 126, 127.
double lines of, 102, 110, 123.
exterior lines of, 102.
fronts of, 92, 330, 338.
in mountainous countries, maxims on, 163.
interior lines of, 102.
line of, how protected, 132.
lines of, 100, 120.
lines of, converging and divergent, 118.
lines of, how established, 114.
lines of, how influenced, 119.
lines of, maxims on, 114.
military, influenced by a cabinet, 42.
objective points of, 85.
objectives of, 329, 330.
of 1809 and 1814, 176, 177.
of the French at the close of 1793, 331-333.
pivots of, 98.
simple lines of, 101.
system of, 72.
system of, how to be judged, 125.
system of, necessary in war, 50.
theater of, 74, 75.
theater of, between the Rhine and the North Sea, 338-340.
theater of, how divided, 71.
zone of, 66.
zone of, how to select, 329.
zones of, 100, 338.

Opinion, public, danger of, 55.
wars of, 25.

Orchomenus, 365.

Order, checkerwise, battalions deployed in, 301.
half-deep, attacks in, 302.
half-deep, infantry formation, 295.
importance of, 42.
in deep masses, infantry formation, 295, 296.
in echelons, 193.
in squares, when suitable for attack, 297.
mixed, infantry formation, 295,
oblique, 199, 200.
of attack in columns, 194.
of battle, 186.
of battle at Agincourt, 192.
at Cannae, 189.
at Crecy, 192.
at Essling, 192, 193.
at Fleurus, 192.
at Leipsic, 193.
at Mollwitz, 348.
at passage of a river, 192.
by echelon, 193.
convex, 192.
definition of, 180.
oblique, 190.
offensive, 200.
of the generals of the Republic, 349.
of infantry as skirmishers, 292.
shallow, infantry, 292.

Orders, best mode of issuing, 259.
how issued by Napoleon, 259.
inaccurate transmission of, 196.
of battle, 188.
of battle, classification of, useful, 197.

Orders of battle, influence of, on result of engagements, 197.
of Napoleon's battles, 198.
should be clear, 258.
two methods of issuing, 258, 259.

Organization and arms of cavalry, 307, 308.
by corps, likely to be permanent, 287.
of an army in four corps, 281.
in seven corps,