I.

Igor, expeditions of, 368.

Illustrations of importance of logistics, 263-268.

Improvements in fire-arms, effect of, on infantry formations, 299. effects of, on war, 347, 355, 359.

Industrial pursuits secondary to heroic virtues, 60, 61.

Infantry, battle-formation of, in two lines, 287. best formation of, for assault, 298. best formation of, for the defensive, 298. cavalry must be supported by, 304. checkerwise formation, 310. formation of, in two deployed lines, 292. formations, effect of improvements in fire-arms on, 299. importance of, 290. in three-rank formation, 293. in what movements should be exercised, 300. lines of battle for, 282-284. mixed order, 295. mounted, 308. needs support of cavalry and artillery, 290. protection of, from enemy's artillery, 303. squares, 294, 296. supports of artillery, 316, 317. three-rank formation of, 291. various formations for, 285. when a line of, should be charged by cavalry, 305.

Information from partisans, 270. of enemy's movements, rules for gaining, 273, 274. of the enemy's movements, four means of acquiring, 269.

Initiative, advantages of, 184.

Institutions, military, 43.

Interior and simple lines, advantage of, 114.

Interior lines, observations on, 123. of Archduke Charles, 136. of operations, 102. of operations, why preferable, 127. should not be too much extended, 117. two armies on, 117.

Intervention, instances of, 20-22. kinds of, 19. reasons for, 19. wars of, 19. wars of, essentials in, 21.

Intestine wars, 35.

Intrenched camp, on which side of a river, 157.

Intrenched camps and lines, defense of, 215. connection of, with strategy, 154. how differ from têtes deponts, 160. influence of, 155. instances of, 210, 211. maxims on, 155, 156. on river, 156. Prussian system of. 158. use of, 156. where to be established, 155.

Intrenched lines, 146, 153. attack of, 214. continuous, 213.

Intrenched positions, 181.

Intrenchments, armies in, 154

Invaded country, how made to contribute to success, 142.

Invasion, advantage and disadvantage of, 72. advantages of awaiting, 17. army of, line of defense important to, 99. control of the sea important in, 30. difficult in national wars, 144. how rendered feasible, 106. of a mountainous country, 169. of England contemplated by Napoleon, 249, 250, 386. of Turkey by Russia, 23. two kinds of, 22. wars of, when advantageous, 17.

Invasions, diplomacy in, 24. distant, across extensive territories, 171. distant, effect of standing armies on, 171. distant, how affected by invention of gunpowder, 171. distant, maxim for, 173. distant, to aid an ally, 170. how to be carried on, 24. neutrality of states adjoining the theater of war important in, 174. of neighboring states, 174. of Spain, 23. when excusable, 23.

Investing a city, false system of, 152. force, how strengthened, 153.

Irregular cavalry, 313. arms for, 313.

Islamism, wars of, 25.

Italy, operations of the French in, 111, 112. parallel retreats in, 241. relation of, in the French Revolution, 104.

Ivar, expedition of, 369.

J.

James II., expedition of, in Ireland, 381.

Jemmapes, 342.

Jena, battle of, won by strategy, 198. maneuvers at, 90. Napoleon's march on, 94. Ney's charge at, 305.

Jourdan, 229. at Stockach, 205. balloons used by, at Fleurus, 275.

Jourdan's passage of the Rhine in 1795, 120.

Julian, retreat of, from Parthia, 233.

K.

Kagoul, panic at, 64.

Katzbach, 124.

Kehl, intrenchments at, 157, 210, 211.

Kolin, 303.

Koudacheff's expedition, 273.

Koutousoff, 170.

Krasnoi, combination at, 342.

Kray, 87.

Kunnersdorf, 304.