 He took part in a number of skirmishes, as well as took part in formation of several cavalry units.On May 12, 1808 Marshal Louis Nicolas Davout promoted Zeydlitz to the rank of commander of the garrison of Kostrzyń (de facto General), and the following year Zeydlitz decided to retire from the army.However, soon afterwards the Polish–Austrian War broke out and he remained in active service as the commanding officer of Łęczyca.