Austria invaded the Duchy of Warsaw with initial success. Poniatowski defeated the Austrians in the Battle of Raszyn on 19 April. This prevented Austrian forces from crossing the Vistula river and forced the Austrians to retreat from occupied Warsaw. The Poles went on to invade Galicia, with some success, but the offensive quickly stalled with heavy casualties. The Austrians also won a few battles but were hampered by Russian troops whose intentions were unclear and did not allow them to advance.