He was weak, vacillating and ineffective as a politician, lacking in judgment and decision, and without any great parliamentary talent.
Later on he attempted to influence the Prussian Northern Union in the direction of the national policy, and he took part in the sessions of the Erfurt parliament; but, soon realizing the hopelessness of any good results from the vacillating policy of Prussia, he retired from the contest, and, as a major in the service of the SchleswigHolstein government, took part in the Danish War of 1850.
The king maintained a vacillating attitude, influenced now by the threats of the Bohemians, now by the advice of the papal nuncio, who had followed him to Prague.
Eugenius was dignified in demeanour, but inexperienced and vacillating in action and excitable in temper.
This contingency explains the vacillating and illogical character of the papal diplomacy with regard to the Byzantine problem, and, inter slid, the opposition of Eugenius III.