This noble-spirited German was the founder of a secret society, the _Tugendbund_, by which a general insurrection against Napoleon was silently prepared throughout Germany. Among its members were numerous statesmen, officers, and literati. Among the latter, Arndt gained great note by his popular style, Jahn by his influence over the rising generation. Jahn reintroduced gymnastics, so long neglected, into education, as a means of heightening moral courage by the increase of physical strength.[2] Scharnhorst, meanwhile, although restricted to the prescribed number of troops, created a new army by continually exchanging trained soldiers for raw recruits, and secretly purchased an immense quantity of arms, so that a considerable force could, in case of necessity, be speedily assembled. He also had all the brass battery guns secretly converted into field-pieces and replaced by iron guns. Napoleon's spies, however, came upon the trace of the _Tugendbund_. Stein, exposed by an intercepted letter, was outlawed[3] by Napoleon and compelled to quit Prussia. He was succeeded by Hardenberg, by whom the treaty of Basel had formerly been concluded and whose nomination was publicly approved of by Napoleon. Scharnhorst and Julius Gruner, the head of the Berlin police, were also deprived of their offices. The Berlin university, nevertheless, continued to give evidence of a better spirit. Enlightenment and learning, on their decrease at Frankfort on the Oder, here found their headquarters. Halle had become Westphalian, and the universities of Rinteln and Helmstädt had, from a similar cause, been closed.