After 1815, Maurycy joined the army of Congress Poland, reaching the rank of full general in 1826 and receiving a title of Polish nobility.

Recognizing his abilities, Tsar Nicholas I appointed him Deputy Minister of War of Congress Poland and elevated him in 1829 to Count.

In the uprising of 1830 led by revolutionary army cadets, the target was Grand Duke Constantine, Poland's Governor-General.

His wife died shortly afterward, and their younger children were made wards of the Tsar, while three elder sons joined the uprising and one of them, Maurice Leopold, fell during the battle of Ostrołęka in 1831 only 27 years old.

After his victory over the Poles, the Tsar raised in 1841 an enormous obelisk in Warsaw, which was dedicated to the memory of Hauke and five other Polish generals who "preserved their fidelity to their Monarch".