 His account to the tsarina of the Battle of Fleurus (1794) won him favour; on returning to St. Petersburg, he was dispatched to serve under Count Valerian Zubov in an ill-fated expedition against Persia, which Emperor Paul I recalled in 1799 in order to deal with the French Revolutionary Wars.In 1797, Korsakov was elevated to inspector general of Infantry, and the following year, general lieutenant.In 1798, Paul I gave Korsakov command of an expeditionary force of 30,000 men sent to Germany to join Austria in the fight against the French Republic.