Friedrich Wilhelm Nietzsche in his Prussian artillery uniform, Naumburg, fall of 1868. In 1867, Nietzsche signed up for one year of voluntary service with the Prussian artillery division in Naumburg. He was regarded as one of the finest riders among his fellow recruits, and his officers predicted that he would soon reach the rank of captain. However, in March 1868, while jumping into the saddle of his horse, Nietzsche struck his chest against the pommel and tore two muscles in his left side, leaving him exhausted and unable to walk for months. Consequently, Nietzsche turned his attention to his studies again, completing them in 1868 and meeting with Richard Wagner for the first time later that year.

Caption exctracted from Wikipedia.