Some important additions were made at the grounds meanwhile, and work went on as usual, though with diminished numbers. In August of 1814 General Blücher paid a visit to the spot, and after watching some of the exercises made a brief address. The Crown Prince, who also appeared there, was especially pleased with the wrestling. The wife of Prince William came with her children, and the sons of Prince Radziwill, the King’s brother-in-law, were on intimate terms with the turners. Jahn was married at Neubrandenburg on August 30, 1814, to Helene Kollhof, whom he had met while he was a private tutor in Mecklenburg, nearly ten years before. During the same summer Bornemann published a “Manual of the Gymnastics Revived by Friedrich Ludwig Jahn under the name of _Turnkunst_,”[44] intended to prepare the way for Jahn’s own book which was not ready until two years later. A society of older turners, consisting originally of nine members, was organized in the fall of 1814, and met every Saturday with Massmann, one of their number, to practise songs, discuss regulations, revise the exercises by series, fix rules for the games, and choose leaders for the squads. The first anniversary of the Battle of Leipsic (October 18 and 19) was celebrated at the Turnplatz with huge signal fires, songs by all the turners, and a great exhibition. The number of spectators on this occasion was estimated at ten thousand, including many persons of distinction and delegates from six neighboring towns. In the fall of 1815 and the following winter gymnastics was again made the subject of associated investigation, and now the results of so much study and experience were gradually brought together into book form. Eiselen undertook the technical portions, with the help of Massmann, Dürre, and others, while Jahn wrote the remainder, decided in doubtful cases, and revised the whole. March 31, 1816, he signed the preface, and on April 29 the finished volume was published under the title _Die Deutsche Turnkunst_ (“German Gymnastics”).[45]