France’s conflicts with its neighbors can be evaluated in the context of its internal strife. Domestically, the French Revolution produced myriad violence and death. In June of 1793, the radical Jacobin party took control of the government and instituted a period that would be called the Reign of Terror. During this time, the government produced lists of people who were supposedly trying to halt the revolution. The alleged anti-revolutionaries were guillotined, so thousands of people lost their lives.
As a part of the revolution, the new French government declared war on some of its neighbors, including Austria and Prussia. The government believed that these nations were harboring enemies to the new government.
At the same time, the new French government felt that it was its duty to spread the revolutionary spirit to other nations. These states were labeled as sister republics. The sister republics were not successful. They mostly resulted in exploitation and plunder, not freedom and liberty.
Revolutionary France also tried to help the Irish fight off their oppressor, England. Alas, inclement weather, among other things, thwarted this alliance. Thus France wasn’t much help to Ireland either.
Overall, the conflicts with neighbors seem to pale in comparison with what was happening in France. As the Reign of Terror demonstrates, France was in disarray. The government couldn’t get its own country in order, which is probably why it had such a hard time imposing itself on other countries—sister republics or otherwise.