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Weimar

In late 1792, Goethe took part in the Battle of Valmy against revolutionary France, assisting Duke Karl August of Saxe-Weimar-Eisenach during the failed invasion of France. Again during the Siege of Mainz, he assisted Karl August as a military observer. His written account of these events can be found within his Complete Works.

In 1794, Friedrich Schiller wrote to Goethe offering friendship; they had previously had only a mutually wary relationship ever since first becoming acquainted in 1788. This collaborative friendship lasted until Schiller's death in 1805.

In 1806, Goethe was living in Weimar with his mistress Christiane Vulpius, the sister of Christian A. Vulpius and daughter of archivist Johann Friedrich Vulpius (1725–1786), and their son August von Goethe. On 13 October, Napoleon 's army invaded the town. The French "spoon guards", the least disciplined soldiers, occupied Goethe's house:

The 'spoon guards' had broken in, they had drunk wine, made a great uproar and called for the master of the house. Goethe's secretary Riemer reports: 'Although already undressed and wearing only his wide nightgown... he descended the stairs towards them and inquired what they wanted from him.... His dignified figure, commanding respect, and his spiritual mien seemed to impress even them.' But it was not to last long. Late at night they burst into his bedroom with drawn bayonets. Goethe was petrified, Christiane raised a lot of noise and even tangled with them, other people who had taken refuge in Goethe's house rushed in, and so the marauders eventually withdrew again. It was Christiane who commanded and organized the defense of the house on the Frauenplan. The barricading of the kitchen and the cellar against the wild pillaging soldiery was her work. Goethe noted in his diary: "Fires, rapine, a frightful night... Preservation of the house through steadfastness and luck." The luck was Goethe's, the steadfastness was displayed by Christiane.

Days afterward, on 19 October 1806, Goethe legitimized their 18-year relationship by marrying Christiane in a quiet marriage service at the Jakobskirche in Weimar. They had already had several children together by this time, including their son, Julius August Walter von Goethe (1789–1830), whose wife, Ottilie von Pogwisch (1796–1872), cared for the elder Goethe until his death in 1832. August and Ottilie had three children: Walther, Freiherr von Goethe (1818–1885), Wolfgang, Freiherr von Goethe (1820–1883) and Alma von Goethe (1827–1844). Christiane von Goethe died in 1816. Johann reflected, "There is nothing more charming to see than a mother with her child in her arms, and there is nothing more venerable than a mother among a number of her children."