At the Battle of Piave River on 8 May 1809, he commanded two battalions of the "Otocaner" Regiment in the IX Armeekorps. None of the sources specify where Gavasini's brigade deployed. However, Albert Gyulai's two VIII Armeekorps brigades held the right flank near Mandre while Johann Kalnássy's IX Armeekorps brigade formed the extreme left flank at Cimadolmo. Late in the afternoon, the Franco-Italian army broke through Ignaz Gyulai's line in the center and forced Archduke John to commit his reserve brigade of grenadiers. When these elite troops failed to stop their enemies, the Austrian army was forced to retreat.