The War of the Fifth Coalition in 1809 had ended with another defeat for the joint forces of the Austrian Empire, Great Britain, Spain, and Portugal against the French and their German allies. Following Napoleon's unsuccessful invasion of Russia in 1812, Prussia joined the countries already at war with France to begin the War of the Sixth Coalition in March 1813. During the early part of the campaign, the allied forces against Napoleon suffered defeats at Großgörschen (2 May) and Bautzen (20–21 May), being driven back to the river Elbe. However, due to lack of training in his newly-recruited soldiers, Napoleon was unable to take full advantage of his victories, allowing his enemies to regroup. Following a ceasefire, Austria rejoined the Coalition on 17 August. The French advantage in numbers was now reversed, with the Coalition forces counting 490,000 soldiers to Napoleon's 440,000.