War of the Fifth Coalition: French general Louis-Nicolas Davout defeated an Austrian force in Lower Bavaria, allowing him to rejoin the main French army.

The War of the Fifth Coalition was a European conflict in 1809 that was part of the Napoleonic Wars and the Coalition Wars. The main conflict took place in Central Europe between the Austrian Empire of Francis I and Napoleon's French Empire. The French were supported by their client states—the Kingdom of Italy, the Confederation of the Rhine and the Duchy of Warsaw. Austria was supported by the Fifth Coalition which included the United Kingdom, Portugal, Spain, and the Kingdoms of Sardinia and Sicily, although the latter two took no part in the fighting. By the start of 1809 much of the French army was committed to the Peninsular War against Britain, Spain and Portugal. After France withdrew 108,000 soldiers from Germany, Austria attacked France to seek the recovery of territories lost in the 1803–1806 War of the Third Coalition. The Austrians hoped Prussia would support them, having recently been defeated by France, but Prussia chose to remain neutral.

Louis-Nicolas d'Avout, better known as Davout, 1st Prince of Eckmühl, 1st Duke of Auerstaedt, was a French military commander and Marshal of the Empire who served during both the French Revolutionary Wars and the Napoleonic Wars. His talent for war, along with his reputation as a stern disciplinarian, earned him the nickname "The Iron Marshal". He is ranked along with Marshals André Masséna, Louis-Gabriel Suchet, and Jean Lannes as one of Napoleon's finest commanders. His loyalty and obedience to Napoleon were absolute. During his lifetime, Davout's name was commonly spelled Davoust - this spelling appears on the Arc de Triomphe and in much of the correspondence between Napoleon and his generals.

The Battle of Teugen-Hausen or the Battle of Thann was an engagement that occurred during the War of the Fifth Coalition, part of the Napoleonic Wars. The battle was fought on 19 April 1809 between the French III Corps led by Marshal Louis-Nicolas Davout and the Austrian III Armeekorps commanded by Prince Friedrich Franz Xaver of Hohenzollern-Hechingen. When the Austrians withdrew that evening, the French won a hard-fought victory over their opponents. The site of the battle is a wooded height approximately halfway between the villages of Teugn and Hausen in Lower Bavaria, part of modern-day Germany.