The breakdown of the Treaty of Amiens led to the War of the Third Coalition by 1805. Napoleon shattered the coalition with a decisive victory at the Battle of Austerlitz, which led to the dissolution of the Holy Roman Empire. In the War of the Fourth Coalition, Napoleon defeated Prussia at the Battle of Jena–Auerstedt in 1806, marched his Grande Armée into Eastern Europe, and defeated the Russians in 1807 at the Battle of Friedland. Seeking to extend his trade embargo against Britain, Napoleon invaded the Iberian Peninsula and installed his brother Joseph as King of Spain in 1808, provoking the Peninsular War, mainly fought by his marshals until 1814. In 1809, the Austrians challenged France in the War of the Fifth Coalition, in which Napoleon solidified his grip over Europe after winning the Battle of Wagram. In summer 1812, Napoleon launched an invasion of Russia, which ended in the catastrophic retreat of his army that winter. In 1813, Prussia and Austria joined Russia in the War of the Sixth Coalition, in which Napoleon was decisively defeated at the Battle of Leipzig. The coalition invaded France and captured Paris, forcing Napoleon to abdicate in April 1814. They exiled him to the Mediterranean island of Elba and restored the Bourbons to power. In February 1815, Napoleon escaped from Elba and again took control of France in what became known as the "Hundred Days". His opponents responded by forming a Seventh Coalition, which defeated him at the Battle of Waterloo in June 1815. Napoleon was exiled to the remote island of Saint Helena in the South Atlantic, where he died of stomach cancer in 1821, aged 51.