Thus Napoleon, in 1796, with an army of only 50,000 combatants, could not venture to penetrate into Austria, with Mantua and its 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.