In the War of the Sixth Coalition, sometimes known in Germany as the Wars of Liberation, a coalition of Austria, Prussia, Russia, Spain, the United Kingdom, Portugal, Sweden, Sardinia, and a number of German States defeated France and drove Napoleon into exile on Elba. After the disastrous French invasion of Russia of 1812 in which they had been forced to support France, Prussia and Austria joined Russia, the United Kingdom, Sweden, and Portugal, and the rebels in Spain who were already at war with France. The invasion of Russia cost the French many seasoned soldiers, so Napoleon took action to engage "Marie-Louises", young conscripts who were barely familiar with military affairs; they were called up from October 1813 to 1815. However, the constant warfare weakened the Coalition nations as well. The Russian military was particularly depleted after 1812, and Prussia also suffered a significant downgrade as a result of its losses in 1806–1807; nevertheless, it carried out large-scale reforms to improve the situation in the Prussian Army.