Friedrich Wilhelm Freiherr von Seydlitz (3 February 1721 – 8 November 1773) was a Prussian officer, lieutenant general, and among the most renowned of the Prussian cavalry generals. He commanded one of the first hussar squadrons of Frederick the Great's army and is credited with the development of the Prussian cavalry to its efficient level of performance in the Seven Years' War. His cavalryman father retired and then died while Seydlitz was still young. Subsequently, he was mentored by Frederick William, Margrave of Brandenburg-Schwedt. Seydlitz's acclaimed horsemanship and recklessness combined to make him a stand-out subaltern, and he emerged as a remarkable Rittmeister (cavalry captain) in the War of Austrian Succession (1740–1748) during the First and Second Silesian Wars.

Seydlitz became legendary throughout the Prussian Army both for his leadership and for his reckless courage. During the Seven Years' War, he came into his own as a cavalry general, known for his coup d'œil, his ability to assess at a glance the entire battlefield situation and to understand intuitively what needed to be done: he excelled at converting the king's directives into flexible tactics. At the Battle of Rossbach, his cavalry was instrumental in routing the French and Imperial armies. His cavalry subsequently played an important role in crushing the Habsburg and Imperial left flank at the Battle of Leuthen. Seydlitz was wounded in battle several times. After the Battle of Kunersdorf in August 1759, he semi-retired to recover from his wounds, charged with the protection of the city of Berlin. He was not healthy enough to campaign again until 1761.

Frederick rewarded him with Order of the Black Eagle on the field after the Battle of Rossbach; he had already received the for his action at the Battle of Kolin. Although Seydlitz was estranged from Frederick for several years, the two were reconciled during Seydlitz's final illness. Seydlitz died in 1773, and Frederick's heirs included his name on the equestrian statue of Frederick the Great in Berlin, in a place of honor.

Early life Seydlitz was born on 3 February 1721, in Kalkar in the Duchy of Cleves, where his father, Daniel Florian von Seydlitz, was a major of Prussian cavalry with the Cuirassier Regiment Markgraf Friedrich Wilhelm of Brandenburg-Schwedt No. 5. In 1726, his father left military service and moved the family to Schwedt, where he became a forestry master in East Prussia; the senior Seydlitz died in 1728, leaving a widow and children in restricted financial circumstances. Limited schooling was available to young Seydlitz; sources differ whether he knew how to speak and write in French, the lingua franca of Frederick the Great's court. One biographer, Bernhard von Poten, maintained that his German was good, and if he knew French, he preferred German and wrote it with a "fine, firm hand, unusually correct, in well-formed sentences and with apt expression", and he knew enough Latin to express himself well. His future sovereign, Frederick, always addressed him in German.

By Seydlitz's seventh year, he could ride a horse well, raced with older boys; he was, by most accounts, a wild and high-spirited child. At the age of fourteen he went as a page to the court of the Margrave Frederick Wilhelm of Brandenburg-Schwedt, who had been his father's colonel. The Margrave was a grandson of the Great Elector, and a nephew to both Frederick I of Prussia and Leopold of Anhalt Dessau. Himself a reckless man, the "Mad" Margrave inspired in young Seydlitz a passion for feats of daredevil horsemanship. Seydlitz did not limit this passion to horses: the Margrave once dared him to ride a wild stag, which he did. Seydlitz became a skilled horseman, and many stories tell of his feats, the best known of which involved riding between the sails of a windmill in full swing. Seydlitz remained in his position as a page to the Margrave until King Frederick William appointed him as cornet in the Margrave's Cuirassier Regiment No. 5 (his father's old regiment) on 13 February 1740.

Military career Promotions Cornet: 13 February 1740 Rittmeister (captain of cavalry): 1743 Major: 28 July 1745 Lieutenant colonel: 21 September 1752 Colonel: 1755 Major general: 20 June 1757 Lieutenant general: 5 November 1757 Inspector General of Cavalry in Silesia: 1763

Seydlitz's first months as a cornet were made difficult by the regimental colonel, who considered him a spy for the margrave, and abused him by sending him on useless errands and generally making it clear that the cornet was no match for the colonel. Within a year of Seydlitz's commission, the old King Frederick William died and his son, Frederick II of Prussia, ascended to the throne. Frederick claimed Silesia from the Habsburg's Maria Theresa, and made a broad appeal to arms. The Margrave's regiment played an important role in the ensuing war, during which Seydlitz came to the notice of the king several times. Once, when Frederick asked the caliber of the artillery shelling the Prussian line, opinions were divided and vague. Seydlitz rode in front of the battery, halting in their line of fire. When he saw a ball hit the ground, he picked it up, wrapped it in his handkerchief and presented it to the king.

On 22 May 1742, near Opawa (Troppau) in Silesia, while stationed with his regiment in Kranowitz, during the First Silesian War, the regimental colonel ordered him to take 30 men and hold a village post until infantry came to his assistance; despite heavy fire, the grudging colonel did not send reinforcements. Realizing what had happened, the brigade's general took three squadrons of heavy cavalry to relieve Seydlitz, but these were turned back by fire from the Austrian line. Subsequently, Seydlitz was forced to surrender his small unit. He entered into Austrian captivity with several of his closest comrades, including Charles de Warnery. Czesław Pieniążek et al., Dzieje powszechne ilustrowane na podstawie najnowszych badań i źródeł historycznych, vol. 6, Vienna: Franciszek Bondego; Kraków: W.L. Anczyc i Spółka, c. 1900, p. .

Frederick exchanged an Austrian captain for Cornet Seydlitz. Upon his return from captivity, Seydlitz had a choice to wait for the first lieutenancy that became available in a cuirassier regiment, or take the immediate command of a troop of hussars, as a captain. Hussars were the newest form of service in the Prussian army, and not as prestigious an assignment as cuirassiers, but Seydlitz chose the immediate promotion to a lesser unit. In 1743, the king made him a Rittmeister (captain) in the 4th Hussars. He entirely skipped the rank of lieutenant. With the 4th Hussars, he was stationed in the city of Trebnitz, and he brought his squadron to a state of conspicuous efficiency.

In August 1744, the king entered Bohemia, took Prague, and then moved south. Lieutenant General Count Nassau led the vanguard, and Seydlitz participated with the Natzmer Hussars, commanded by Major Hans Heinrich Adam Schütz, a violent man of whose conduct of warfare Seydlitz disapproved. Seydlitz served through the Second Silesian War. On 22 May, Hans Karl von Winterfeldt, trusted by the king as a good judge of character, reported to Frederick: "Certainly, at Hohenfriedberg, on the 4 June, [Seydlitz] captured the Saxon general [Georg Sigismund] von Schlichting personally, after he had cut the reins from him." Based largely on his conduct at Hohenfriedberg and Winterfeldt's recommendation, Frederick promoted Seydlitz to major on 28 July at the unusually young age of twenty-four.

Seydlitz led his squadron at the Battle of Soor on 30 September, scouting the enemy's position before the battle, and then participating in the action. He was also present in the engagement at Katholisch-Hennersdorf on 23 November, which proved convincingly to Frederick the benefit of close support during a cavalry charge. At the successful action on 27 November, Seydlitz led 15 squadrons in an attack on the Austrian rear guard. The Austrians were dispersed and nearly destroyed.

Development of cavalry tactics

After Frederick concluded the peace on 25 December 1748, Seydlitz returned with his squadron to Trebnitz. In the subsequent years of peace, Seydlitz developed flexible cavalry tactics. He assembled a plan on tactical form and training for the Prussian cavalry and presented it to the king. Frederick approved the procedures and Seydlitz established a rigorous training program. He would leave his own estate by jumping the gate; he required similar horsemanship from all his men, regardless of whether they were cuirassiers, hussars or dragoons. They had to be capable of galloping across broken fields, wheeling in formation, and riding in close action. Furthermore, they had to be prepared to support any movement of infantry, or to react to any action from the enemy. Under Seydlitz's direction, possibly influenced by the ideas of Frederik Sirtema van Grovestins, Prussian cavalry learned to use only their swords, as pistols or carbines could not be fired with accuracy and had to be reloaded. Frederick set up straw dummies for his troopers to shoot; their shots were woefully inaccurate, but Seydlitz's tactics demonstrated that the troopers could hit their target with a sword every time. Generally, cavalry horses were the sturdy Trakehners, from Frederick's stud farm in Trakehnen, East Prussia.

On 21 September 1752, after a successful review in which the different cavalry forms demonstrated their competencies, the king promoted Seydlitz to lieutenant colonel and the commander-in-chief of cavalry and, on 13 October of the same year, to the commander of the Dragoon Regiment Württemberg No. 12, whose staff was at Treptow. Frederick was not satisfied with the regiment's performance, and instructed Seydlitz to "put it back into order". In 1753 Frederick appointed Seydlitz to the command of the 8th Cuirassiers. In Seydlitz's hands, this regiment soon became a model for the rest of the Prussian Army's mounted force. In 1755 Frederick promoted him to colonel.

By the start of the Seven Years' War, Seydlitz's transformed cavalry had become Frederick's pride and joy: it had unrivaled training and an esprit de corps bolstered by Frederick's confidence in its members, and by their confidence in Seydlitz. The king had issued orders that no Prussian cavalryman would allow himself to be attacked without a commensurate response, under penalty of being cashiered; consequently, Prussian cavalrymen were active, impetuous and aggressive. For the king, Seydlitz's cavalry became the dynamic factor in the army of the state, and would be the tool by which Frederick could challenge empires. In 1756, Seydlitz's cavalry became Frederick's weapon of choice.

Seven Years' War

In May 1757, in defiance of the custom of holding the heavy cavalry in reserve, Seydlitz brought his regiment forward to join the advance guard at the Battle of Prague. Here he nearly lost his life attempting to ride through a marshy pool; his horse became stuck in quicksand and his troopers pulled him away. At the Prussian loss at Kolin in June 1757, he and a cavalry brigade checked the Austrian pursuit by a brilliant charge. Two days later, the king promoted him to major general and awarded him the Pour le Mérite. Seydlitz felt he had deserved the promotion for a long time, for he responded to Hans Joachim von Zieten's congratulations by saying, "It was high time, Excellency, if they wanted more work out of me. I am already thirty-six."