Gebhard Leberecht von Blücher, Fürst von Wahlstatt (December 16, 1742 – September 12, 1819), Graf (Count), later elevated to Fürst (Prince) von Wahlstatt, was a Prussian Generalfeldmarschall (field marshal) who led his army against Napoleon I at the Battle of the Nations at Leipzig in 1813 and at the Battle of Waterloo in 1815 with the Duke of Wellington. He is honoured with a bust in the German Walhalla temple near Regensburg.

The honorary citizen of Berlin, Hamburg and Rostock bore the nickname "Marschall Vorwärts" ("Marshal Forward") because of his approach to warfare. There was a German idiom, "ran wie Blücher" ("on it like Blücher"), meaning that someone is taking very direct and aggressive action, in war or otherwise.

Gebhard Leberecht von Blücher was born in Rostock, Mecklenburg, a Baltic port in northern Germany. His family had been landowners in northern Germany since at least the 13th century.

He began his military career at sixteen, when he joined the Swedish Army as a Hussar. At the time Sweden was at war with Prussia in the Seven Years' War. Blücher took part in the Pomeranian campaign of 1760, where he was captured in a skirmish with Prussian Hussars. The colonel of the Prussian regiment, Belling, was impressed with the young hussar and had him join his regiment.

He took part in the later battles of the Seven Years' War, and as a hussar officer gained much experience of light cavalry work. In peace, however, his ardent spirit led him into excesses of all kinds, such as mock execution of a priest suspected of supporting Polish uprisings in 1772. Due to this, he was passed over for promotion to Major. Blücher sent in a rude letter of resignation, which Frederick the Great granted in 1773: Der Rittmeister von Blücher kann sich zum Teufel scheren (Cavalry Captain von Blücher can go to the devil).

He then settled down to farming, and in fifteen years he had acquired an honorable independence, a wife, 7 children, and membership in the Freemasons. During the lifetime of Frederick the Great, Blücher was unable to return to the army, but after the king's death in 1786, he was reinstated as a major in his old regiment, the Red Hussars in 1787.

Blücher took part in the expedition to the Netherlands in 1787, and the following year was promoted to lieutenant colonel. In 1789 he received Prussia's highest military order, the Pour le Mérite, and in 1794 he became colonel of the Red Hussars. In 1793 and 1794 he distinguished himself in cavalry actions against the French, and for his success at Kirrweiler was promoted to major general. In 1801 he was promoted to lieutenant general.

He was one of the leaders of the war party in Prussia in 1805 – 1806, and served as a cavalry general in the disastrous campaign of the latter year. At Auerstedt Blücher repeatedly charged at the head of the Prussian cavalry, but too early and without success. In the retreat of the broken armies he commanded the rearguard of Prince Hohenlohe's corps, and upon the capitulation of the main body at Prenzlau, he led a remnant of the Prussian army away to the north, after having secured 34 cannon in cooperation with Scharnhorst. In the neighborhood of Lübeck he fought a series of combats, which, however, ended in his being forced to surrender at Ratekau (November 7, 1806). Blücher insisted that a clause be written in the capitulation document that he had to surrender due to lack of provisions and ammunition, and that his soldiers be honoured by a French formation along the street. He was allowed to keep his sabre and to move freely, only bound by his word of honour, and soon was exchanged for Marshal Claude Victor-Perrin, duc de Belluno, and was actively employed in Pomerania, at Berlin and at Königsberg until the conclusion of the war.

After the war, Blücher was looked upon as the natural leader of the Patriot Party, with which he was in close touch during the period of Napoleonic domination. But his hopes of an alliance with Austria in the war of 1809 were disappointed. In this year he was made general of cavalry. In 1812 he expressed himself so openly on the alliance of Russia with France that he was recalled from his military governorship of Pomerania and virtually banished from the court.

Following the start of the 1813 War of Liberation, Blücher was again placed in high command, and he was present at Lützen and Bautzen. During the armistice, he worked on the organization of the Prussian forces, and when the war was resumed, became commander-in-chief of the Army of Silesia, with August von Gneisenau and Muffling as his principal staff officers and 40,000 Prussians and 50,000 Russians under his command.

The irresolution and divergence of interests usual in allied armies found in him a restless opponent. Knowing that if he could not induce others to co-operate he was prepared to attempt the task at hand by himself often caused other generals to follow his lead. He defeated Marshal Macdonald at the Katzbach, and by his victory over Marshal Marmont at Möckern led the way to the decisive defeat of Napoleon at Leipzig. This was the fourth battle between Napoleon and Blucher and the first that Blucher won. Leipzig was taken by Blücher's own army on the evening of the last day of the battle. On the day of Möckern (October 16, 1813) Blücher was made a field marshal, and after the victory he pursued the French with his accustomed energy. In the winter of 1813 – 1814 Blücher, with his chief staff officers, was mainly instrumental in inducing the allied sovereigns to carry the war into France itself. The combat of Brienne and the Battle of La Rothière were the chief incidents of the first stage of the celebrated campaign of 1814, and they were quickly followed by victories of Napoleon over Blücher at Champaubert, Vauchamps and Montmirail. But the courage of the Prussian leader was undiminished, and his great victory at Laon (March 9 to 10) practically decided the fate of the campaign.

After this, Blücher infused some of his energy into the operations of Prince Schwarzenberg's Army of Bohemia, and at last this army and the Army of Silesia marched in one body directly towards Paris. The victory of Montmartre, the entry of the allies into the French capital, and the overthrow of the First Empire were the direct consequences. Blücher was inclined to punish the city of Paris severely for the sufferings of Prussia at the hands of the French armies, but the allied commanders intervened. Blowing up the Jena Bridge near the Champ de Mars was said to be one of his contemplated acts.

On June 3, 1814, he was made Prince of Wahlstatt (in Silesia on the Katzbach battlefield), and soon afterwards he paid a visit to England, where he was received enthusiastically everywhere he went.

After the war he retired to Silesia, but the return of Napoleon from Elba soon called him back to service. He was put in command of the Army of the Lower Rhine, with General August von Gneisenau as his chief of staff. In the campaign of 1815, the Prussians sustained a serious defeat at the outset at Ligny (June 16), in the course of which the old field marshal was repeatedly ridden over by cavalry and lay trapped under his dead horse for several hours, his life saved only by the devotion of his aide-de-camp, Count Nostitz. He was unable to resume command for some hours, and Gneisenau drew off the defeated army and rallied it. After bathing his wounds in brandy, and fortified by liberal internal application of the same, Blücher rejoined his army. Gneisenau feared that the British had reneged on their earlier agreements and favored a withdrawal, but Blücher convinced him to send two Corps to join Wellington at Waterloo. He then led his army on a nearly endless, tortuous march along muddy paths, arriving on the field of Waterloo in the late afternoon. With the battle hanging in the balance Blücher's army intervened with decisive and crushing effect, his vanguard drawing off Napoleon's badly needed reserves, and his main body being instrumental in crushing French resistance. This victory led the way to a decisive victory through the relentless pursuit of the French by the Prussians. The allies re-entered Paris on July 7.

Prince Blücher remained in the French capital for a few months, but his age and infirmities compelled him to retire to his Silesian residence at Krieblowitz (now Krobielowice in Poland), where he died in 1819, aged 76.

In 1945 his grave was destroyed by Soviet troops and his corpse exhumed. As of 2008, in Poland, von Blücher's grave remains in its destroyed state.

Blücher retained to the end of his life that wildness of character and proneness to excesses which had caused his dismissal from the army in his youth, but, however they may be regarded, these faults sprang always from the ardent and vivid temperament which made him a dashing leader of people. Whilst by no means a military genius, his sheer determination and ability to spring back from errors made him a competent leader.

He was twice married, and had, by his first marriage, two sons and a daughter. Statues were erected to his memory at Berlin, Breslau, Rostock and Kaub. In gratitude for his service, an early British locomotive engineer named a locomotive after him, and Oxford University granted him an honorary doctorate (Doctor of Laws), about which he is supposed to have said that if he was made a doctor they should at least make Gneisenau an apothecary. Three ships of the German navy have been named in honour of Blücher. The first to be so named was a corvette built at Kiel's Norddeutsche Schiffbau AG (later renamed the Krupp-Germaniawerft) and launched 20 March 1877. Taken out of service after a boiler explosion in 1907, she ended her days as a coal freighter in Vigo, Spain. On 11 April 1908, the Panzerkreuzer SMS Blücher was launched from the Imperial Shipyard in Kiel. This ship was sunk on 24 January 1915 in WWI at the Battle of Dogger Bank. The World War II German heavy cruiser Blücher was sunk in the invasion of Norway: both ships to carry the name Blücher in the World Wars were sunk within eight months of the respective war commencing.