The Prussian Aggression War (1831-1832), also known originally as the Second Great European War, and the War of 1831, was a conflict fought between Prussia, United Kingdom, and Sweden, allied by the North Sea Pact against the members of the French Empire, and various "associates" to the empire, including Italy, the Confederation of the Rhine, Poland and the Netherlands, as well as Austria-Hungary and Russia. The war gained its regular name as it has been determined that Prussia started the war with Operation Westschlag against Poland and the later invasion of Austria-Hungary. The war ended with the defeat of the North Sea Pact, as well as large territorial gains made by France and her allies.