Jomini was thus engaged when the retreat from Moscow and the uprising of Prussia transferred the seat of war to central Germany. He promptly rejoined Ney and took part in the Battle of Lützen. As chief of the staff of Ney's group of corps, he rendered distinguished services before and at the Battle of Bautzen. For this he was recommended for the rank of general of division. Berthier, however, not only erased Jomini's name from the list but also put him under arrest and censured him in army orders for failing to supply certain staff reports that had been called for. How far Jomini was responsible for certain misunderstandings that prevented the attainment of all the results hoped for from Ney's attack at Bautzen is unknown. However, the pretext for censure was in Jomini's own view trivial and baseless, and during the armistice Jomini did as he had intended to do in 1809–1810 and went into the Russian service.