Answer:
The main opponents of Napoleon was Britain, and later joined by Austrio-Hungary, Germany, the Russian Empire, and many other smaller nations.
These countries felt a need to oppose France under Napoleon, for they themselves had monarch governments, and on seeing the French Revolution that led to the capitulation of the Royal government and civil unrest, which led to the rise of (what they thought) was a fanatical Bonaparte, they believed that, if their own people took a hold of the ways of the French, that they themselves would be thrown out of power. This led to the governments of these other nations to band together to throw Bonaparte out and reinstate the royal family to re-balance the royal structure in Europe.
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If you're talking about WWI then their military was restricted heavily, they had war reparations, and all of this was topped off with out of control debt and inflation. Essentially, everyone was mad and poor.
Five signers were captured by the British as traitors and tortured before they died.
Twelve had their homes ransacked and burned.
Two lost their sons serving in the Revolutionary Army, another had two sons captured.
Nine of the 56 fought and died from wounds or hardships of the Revolutionary War.
