The Italians had some early successes. They partially took Monte Nero (Monte Krn), took Monte Colowrat, and captured the heights around Plezzo. However, they were unable to dislodge the Austro-Hungarian troops from the high ground between Tolmino and the Isonzo, which would later form a launching off point for the Caporetto Offensive. The heaviest fighting occurred around Gorizia. In addition to the natural defenses of the river and mountains, bastions were created at Oslavia and Podgora. The fighting at Gorizia consisted of street-by-street urban combat interspersed with artillery fire. Italian troops, such as the Italian Re and Casale Brigades, were able to advance as far as the suburbs but could get no further and were driven back. They made small footholds at Adgrado and Redipuglia on the Karst Plateau south of Gorizia but were unable to do much else.