Answer:
As president, James Madison fought against the French navy for seizing American ships.
During Madison's presidency in the early 19th century, France was engaged in a series of wars with other European powers, including Great Britain. As part of this conflict, French privateers began seizing American ships in an effort to disrupt British trade. Madison, along with many other Americans, believed that these actions violated American neutrality and sovereignty, and he took a firm stance against them.
In 1809, Madison authorized the use of force against any French vessels that attempted to interfere with American trade, and he also sent a diplomatic envoy to France to negotiate a resolution to the dispute. While the negotiations were ultimately successful, tensions between the U.S. and France remained high for several years.
It is worth noting that as secretary of state, Madison did not oversee the Louisiana Purchase from France - that was President Thomas Jefferson's decision. Madison did play a role in negotiating the Treaty of Ghent, which ended the War of 1812 between the U.S. and Great Britain, but he did not encourage the U.S. to fight in the Napoleonic War. And while Madison did push for declaring war against the British in June 1812, he did not call for a war against the French.