They only increase the jealousy and put peace further away than before, unless there is real conquest, division, and absorption.
Bismarck declared in 1867 that he was opposed to any war upon France, and that if the military party convinced him of ability to crush France and occupy Paris, he would be unalterably opposed to the attack.

For, said he, one war with France is only the first of at least six, and were we victorious in all six, it would only mean ruin for Germany, and for her neighbor and best customer.
"Do you think a poor, bankrupt, starving, ragged neighbor as desirable as a healthy, solvent, fat, well-clothed one ?" demanded Bismarck.
France attacked Germany in 1870 and found her well-prepared armies impregnable.

Many believe that the Allies will find the German trench-defences now impregnable.

I do not think the Allies will pay the price in human sacrifice to invade Germany from the west.

The break-up of Germany is more likely to come from her exhaustion and the weakness of Austria, against which the pressure will be steadily increased.