garrison of 25,000 men in his rear, and an Austrian force of 40,000 before him. But in 1806 the great superiority of his army enabled him to detach forces to besiege the principal fortresses of Silesia, and still to continue his operations with his principal forces. The chief of the army may meet the enemy under circumstances such as to induce or compel him to give battle. If he should be victorious, the enemy must be pursued and harassed to the uttermost. If he should be defeated, he must form the best plan, and provide the best means of retreat. If possible, he must take shelter in some line of fortifications, and prepare to resume the offensive. Lines of intrenchment and temporary works may sometimes serve him as a sufficient protection. Finally, when the unfavorable season compels him to suspend his operations, he will go into winter cantonments, and prepare for a new campaign. Such are the ordinary operations of war: its relations to strategy must be evident, even to the most superficial reader. Not unfrequently the results of a campaign depend more upon the strategic operations of an army, than upon its victories gained in actual combat. Tactics, or movements within the range of the enemy's cannon, is therefore subordinate to the _choice of positions_: if the field of battle be properly chosen, success will be decisive, and the loss of the battle not disastrous; whereas, if selected without reference to the principles of the science, the victory, if gained, might be barren, and defeat, if suffered, totally fatal: thus demonstrating the truth of Napoleon's maxim, that success is oftener due to the genius of the general, and to the nature of the theatre of war, than to the number and bravery of the soldiers. (Maxim 17, 18.) We have a striking illustration of this in the French army of the Danube, which, from the left wing of General Kray, marched rapidly through Switzerland to the right extremity of the Austrian line, "and by this movement alone conquered all the country between the Rhine and Danube without pulling a trigger." Again, in 1805, the army of Mack was completely paralyzed, and the main body forced to surrender, at Ulm, without a single important battle. In 1806, the Prussians were essentially defeated even before the battle of Jena. The operations about Heilesberg, in 1807, the advance upon Madrid, in 1808, the manoeuvres about Ratisbon, in 1809, the operations of the French in 1814, and the first part of the campaign of 1815, against vastly superior numbers, are all familiar proofs of the truth of the maxim. Strategy may therefore be regarded as the most important, though least understood, of all the branches of the military art.[4]