At the start of 1870 August Eisenhart was plucked from the relative obscurity of the Bavarian Justice System and appointed cabinet secretary to the king. The appointment was almost certainly made at the instigation of Johann von Lutz, head of the Bavarian government. The king was becoming ever more reluctant to see people, and often stayed away from the capital for months on end, preferring the seclusion afforded by his growing collection of opulent remotely located "modern castles". That left the running of Bavaria in the hands of the government. Von Eisenhart became the only link between the king and the government. It was potentially a highly influential position, especially since the dutiful sober minded official had little natural sympathy with the king's fantastical visions and opinions. Von Eisenhart's own politics seem to have combined powerful monarchist instincts with a lawyerly respect for the institutions of state and an enthusiasm the enlightenment thinking which had become mainstream among intellectuals across western Europe in the aftermath of the French revolution. . But sources insist that von Eisenhart's natural timidity and strong sense of duty meant that he never exploited his position for personal gain, nor indeed to promote any political vision of his own. His principal challenges seem to have been those involved in "managing the king" who could be powerfully resistant to following the advice coming from his ministers in Munich. Through the critical unification process of 1870, choreographed from Berlin by Chancellor Bismarck, the Bavarian king needed particularly careful handling. In the end the treaty of 23 November 1870 whereby the Kingdom of Bavaria entered into an "eternal union" with the North German Confederation was ratified by the king, according to one source, only "through the energetic advice" ("...das energische Zuraten...") of Cabinet Secretary von Eisenhart. (Other sources insist that, following the shock of defeat in 1866, Ludwig's consent was based on having reached for himself the pragmatic conclusion that Bavaria had no choice but to support the union of a "small German" state - excluding Austria and / or that large and at this stage secret cash payment arranged by Bismarck played their part.) Von Eisenhart saw it as an important part of his duty to conceal from the Bavarian public he extent to which the head of state was absenting himself from his royal duties, and to ensure that the duties involved were nevertheless seen to be properly carried out. It was no easy task, and in the end his health suffered. Early in 1876 he applied to the king for a transfer, which the increasingly irascible king refused. A couple of months later, however, the king changed his mind, and on 12 May 1876 it was the king himself signed the letter of discharge suspending von Eisenhart from his duties. Some sources see von Eisenhart's abrupt change of career as gratuitously undignified, but it seems to have led to an outcome that suited both parties. Von Eisenhart accepted an appointment in a less exposed area of government service as a "Staatsrat im Ministerialdienst" (loosely, "Ministerial Counsellor of State"), a post he filled till his retirement, enjoying the opportunity to spend more time with family and friends and devote time to the music which he loved. He lived on for almost a further three decades after 1876, so presumably his health recovered.
