Details are as follows:
On the surface, because the French Revolution cut off the king's head and all European countries were relatives, they sent troops to avenge their relatives. This is an excuse. The internal reason is that before the French Revolution, France was the biggest power in Europe at that time, which is not worth boasting about. At that time, France was not only the first in the army, but also the navy defeated the British navy everywhere in the American War of Independence.
After the Louis XIV era, European countries were basically crushed by France, so when the domestic chaos multiplied, everyone thought of sending troops to defeat France, on the one hand, weakening France, on the other hand, expanding their own interests and striving for more interests for themselves.
The British wanted to destroy the exclusive maritime interests of the French navy, Austria, Prussia and Italy wanted to defeat France to realize the reunification of Germany and Italy, and Russia wanted to defeat France to annex Poland and the Balkans, so everyone came together to form an anti-French alliance.
Spain helped Napoleon a lot in the war, but they all lost miserably.
The Spanish and French fleets in the Trafalgar naval battle were wiped out by the British navy. In the war against Russia, there were also hundreds of thousands of Spanish troops among the 600,000 troops, and they also lost cleanly.
In addition, Spain itself bears a grudge against France. 1807, France invaded Spain and expelled the royal family. 18 12 years, some Spanish troops turned back at the call of the royal family. Finally, in 18 13, the alliance between France and Spain disintegrated, and Spain joined the anti-French alliance against France.
Extended data
The anti-French alliance is an alliance formed by European countries to fight against the emerging bourgeoisie France from 1793 to 18 15 years. The first anti-French alliance and the second anti-French alliance were to fight against the first Republic of France; The following five alliances were all against the first French Empire under Napoleon.
The anti-French alliance fought a war with France for more than 20 years. The first and second wars between the anti-French alliance and the French Republic were called the French Revolution War, and the last five wars between the alliance and the French Empire were called the Napoleonic Wars. The first five anti-French alliances ended in failure, and France ruled by Napoleon became the overlord of the European continent.
The sixth anti-French alliance won and overthrew the first French empire, while Napoleon was exiled to the island of Elba, and the Bourbon dynasty that perished in French history was restored. The seventh anti-French alliance completely defeated Napoleon who made a comeback.