The Austro-Hungarians have crossed the Drina near Velino Selo, attempting another invasion of Serbia. But they are unable to advance from their bridgehead and are suffering terribly from Serbian fire. Now they withdraw back across the river, suffering more casualties as they do. Corpses will float downstream for days.
Elsewhere the Austro-Hungarian advance makes some headway, but this is hardly the march of righteous vengeance that Conrad and Potiorek had hoped for.