Answer:
The contrast the author is making between the two French friends and their enemies the Prussians is showing that the French are jovial and friendly people and the Prussians are a bunch of savages.
Step-by-step explanation:
From the passage given, the author is making a contrast between the French friends and the Prussians by depicting the Prussians are destroyers, pillagers, and generally savages, and the French are filled with humor and friendliness.
This is highlighted by the author describing the Prussians as people who are "ruining France, pillaging, massacring and starving them" while the French contrast is shown when Morissot asked what they would do if they met any Prussian and Monsieur Sauvage replied that they would offer them some fish which shows that they are a friendly and jovial people.