Weyrother was born in Vienna as the son of cavalry Major Anton von Weyrother, who was Chief Rider of the Spanish Riding School in Vienna. After studying at the Ingenieurakademie in Vienna, he joined the army as a Fahnencadet in Infanterie-regiment Nr. 22 Franz von Lacy on 1 December 1775 as Lacy was his godfather. On 1 May 1777, he was promoted to Fähnrich and on 16. November 1778 to Unterlieutenant. In August 1779, he was chosen by GeneralmajorMajor General Graf Wenzel Colloredo as his adjutant and stayed in post until 1783. On 1 June 1784, he was promoted to Oberlieutenant and after his transfer on 1 August 1787 to Infanterie-regiment Nr. 2 Erzherzog Ferdinand, he served in the 1788—1790 Turkish War as Adjutant of FeldmarschalleutnantMaximilian Browne and on 1 February 1789, was appointed to Capitain-lieutenant followed by Hauptmann on 6 July. The War of the First Coalition brought about Weyrother's important transfer to the Generalquartiermeisterstab on 16 July 1794 and he joined its former chief, Generalmajor Neu, who was now the Governor of the key fortress of Mainz, where he soon gained the reputation of a cunning and well-educated officer, who was entrusted by Major General Neu with defensive actions against the French besiegers, when Neu was too ill to direct them. he moved over to offensive operations and on 19 November 1794, took the Wissenau Lines, followed by the Zahlbach Lines on 1 December. GM Neu commended him to FeldmarschallAlbert Casimir, Duke of Teschen for his untiring efforts and exceptional skills on 1 December 1794. Feldzeugmeister Graf von Wartensleben commended Hauptmann Weyrother to Feldmarschall Clerfayt for his skillful leadership of the advance-guard in the assault on the Hartberg in May 1795, which led to his promotion to Major on 22 May, but on 30 August, in repelling a French assault on the Wissenau Lines, Weyrother was shot in the left shoulder. After his recovery, he was sent to the Army of the Rhine under the Archduke Charles to serve on his staff. On 11 May 1796, was awarded the Military Order of Maria Theresia and was promoted to Oberstleutnant.
Italy and Bavaria
In September 1796, Weyrother transferred to Northern Italy, where he fought in the Battle of Bassano under Field MarshalDagobert von Wurmser, distinguishing himself at the Battle of Bassano on 6 November 1796. He then joined the renewed effort to relieve the Mantua, serving on the staff of Feldzeugmeister József Alvinczi, helping to plan the campaign, which ended in a narrow defeat by Bonaparte at the Battle of Arcole. His own plan for the Battle of Rivoli provided for three widely separated striking forces and unrealistically called for one flanking column to march across mountainous terrain in January. His plans were compromised by Napoleon's chief spy, Toli, who obtained a copy of the plan for the advance in January 1797, which ended in a decisive Austrian defeat at the Battle of Rivoli and the consequent surrender of the fortress of Mantua. One of a group of three, known as "Thugut's Benjamins", Magnano and, now serving as liaison officer with the Russian Field Marshal Alexander Suvorov, at Novi on 15 August. He then planned the epic march of the Russian troops under Alexander Suvorov across the Saint Gotthard Pass. Promoted to Oberst on 5 February 1800, Weyrother was given command of Infanterie-regiment Nr. 7 Schröder, which was part of the army in Germany under Pál Kray, but a further wound and the strains of campaigning led to his leaving the army to recuperate. Recalled in the autumn of 1800, Emperor Francis II assigned him to be chief-of-staff to the 18-year-old Archduke John of Austria, the new commander of the army in Bavaria, and his Adlatus Franz von Lauer. Believing Jean Moreau's French army to be in retreat, Weyrother organised an aggressive pursuit through heavily forested terrain by four non-mutually-supporting columns. Instead, Moreau stood his ground, sprang an ambush, and enveloped the Austrian left flank. The resulting Battle of Hohenlinden turned out to be a catastrophe for the Austrians, effectively ending the War of the Second Coalition. Nevertheless, Weyrother was appointed military adviser to the new Foreign Minister, Graf Ludwig Cobenzl in the negotiations following the Armistice of Steyr, which led to the Peace of Luneville in 1801.
Napoleonic Wars
When the War of the Third Coalition broke out, Weyrother was promoted to Generalmajor. After the death of the Allied army chief of staff, Johann Heinrich von Schmitt at the Battle of Dürenstein on 11 November 1805, the Allied commander-in-chief, the Russian General Mikhail Kutusov requested that Weyrother be made chief of staff of the Austro-Russian army. Although the two men soon fell out, as Kutuzov wanted a defensive strategy, Weyrother gained the favour of Tsar Alexander I of Russia with his aggressive strategy. With the Tsar's support, he created the plan for the Battle of Austerlitz in which the Allies were crushed by Napoleon on 2 December 1805. The defeat was so bad, the Russians accused Weyrother of being in the pay of the French. Weyrother withdrew from military life and retired to Vienna, where he died aged 51. His inappropriate dispositions for the battle at Austerlitz are satirized by Leo Tolstoy in War and Peace.
