the enemy, 63.

Contravallation, lines of, 152.

Control of operations, 52.

Convergent operations, 126.

Converging lines more advantageous than divergent, 118.

Continuous intrenched lines, 213.

Control of the sea, importance of, in an invasion, 30.

Convex order of battle, 192.

Copenhagen, siege of, 384.

Cordon system, 165.

Corps, organization by, likely to be permanent, 287.
organization of an army in four, 281.
organization of an army in seven, 281.
system of, 279.
two, one behind the other, 285.

Cossacks, 272, 273, 313, 314.

Council of war at seat of government, 59.

Councils of war, value of, 58.

Counselors, authority of, 53.

Coup-d'oeil, strategic, 337-345.

Coups de main, 215.
instances of, 216, 223.

Crecy, order of battle at, 192.

Crimea, details of the allied expedition to, 387-389.

Crimean War, 387.

Critical moment of battles, 203.

Crossing a river in presence of an enemy, 120.

Crotchet, parallel order of battle with, 189.

Crotchets, danger of, 182.

Crusade of 1203, 373.

Crusades, 25, 371-375.

Cuirass, 47, 308.

Cuirassiers, 308.

Culm, 221.

Cyprus, Turkish expedition against, 377.

D.

Danes, incursions of, 368, 369.

Danger of two wars at once, 36.

Dangers of auxiliary armies, 170.

Danube, Napoleon's passage of, 226.
valley of, key of Southern Germany, 162.

Decisive direction, 328.
moment of battle, 334.
point at Bautzen, 187.
point, how affected by arrangement of forces, 187.
point of battle-field, 187.
point of battle-field, how determined, 88, 186.
points, 337.
points, defiles as, 87.
points of the theater of war, 85.

Deep columns, 356.
at Waterloo, 359.
masses, 298, 302.
order, disadvantages of, 298.

Defeat, 68.
of the French at Waterloo, causes of, 359.

Defense, in mountainous countries, 163.
line of, important to an army of invasion, 99.
line of, should be short, 98.
of frontiers, 146.
of intrenched camps and lines, 215.
rivers, mountains, and defiles as eventual lines of, 96.
second lines of, 147.
should not be passive, 185.
tactical, of Switzerland, 169.
maxims for frontier, 148, 149.

Defensive armor for cavalry, 308.
army has the advantage, when, 202.
army, proper course for, 324.
arrangements for battle, 201.
battles, 179.
best formation of infantry for, 298.
cavalry in, 306.
characteristics of infantry formation for, 297.