The Battle of Möckern was a series of heavy clashes between allied Prusso-Russian troops and Napoleonic French forces south of Möckern. It occurred on 5 April 1813. It ended in a French defeat and formed the successful prelude to the "Liberation War" against Napoleon (the German name for the German theatre of the War of the Sixth Coalition).
In winter 1812, Napoleon had suffered a heavy defeat before Moscow upon which Prussia began to consider giving up its enforced alliance with the French. It signed the Convention of Tauroggen with Russia on 30 December 1812, stipulating neutrality between them, and then on 27 March 1813 both powers declared war on France.
Meanwhile, in March 1813, the Allied armies decided to attack French forces in Magdeburg so that they could then cross the River Elbe and advance westwards. Troops were also sent off under the command of the Prussian generals Bülow, Borstel, Hühnerbein and Yorck as well as the Russian commanders Wittgenstein and Berg. After the French received information of the advance, about 30,000 men left Magdeburg under viceroy Eugène on 2 April 1813 and crossed the Elbe, setting up his headquarters in Königsborn. Wittgenstein, who was in overall command of the Allied operations, planned to use feints further to the east to draw in the French and then cut them off after they returned to Magdeburg.
In expectation of an attack, the French formed their troops along the river Ehle between Möckern and Gommern. The allies arranged a total of about 10,000 men in three detachments marching in from the northeast, east and southeast. Smaller clashes were already happening on the 3rd and 4 April, with the French committing few troops to the fighting. Messages also began to arrive stating that the French wished to withdraw from Magdebury and so Wittgenstein gave the command to attack on 5 April.