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MAXIM XX.

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It may be laid down as a principle, that the line of operation should not be abandoned; but it is one of the most skilful manœuvres in war, to know how to change it, when circumstances authorize or render this necessary. An army which changes skilfully its line of operation deceives the enemy, who becomes ignorant where to look for its rear, or upon what weak points it is assailable.

NOTE.

Frederick sometimes changed his line of operation in the middle of a campaign; but he was enabled to do this, because he was manœuvring at that time in the centre of Germany—an abundant country, capable of supplying all the wants of his army in case his communications with Prussia were intercepted.

Marshal Turenne, in the campaign of 1746, gave up his line of communication to the allies in the same manner; but, like Frederick, he was carrying on the war at this time in the centre of Germany, and having fallen with his whole forces upon Rain, he took the precaution of securing to himself a depôt upon which to establish his base of operation.

By a series of manœuvres, marked alike by audacity and genius, he subsequently compelled the imperial army to abandon its magazines, and retire into Austria for winter quarters.

But these are examples which it appears to me should only be imitated when we have taken full measure of the capacity of our adversary, and above all, when we see no reason to apprehend an insurrection in the country to which we transfer the theatre of war.