In August 1917, his unit was involved in the battle for Mount Cosna, a heavily fortified objective on the border between Hungary and Romania, which they took after two weeks of difficult uphill fighting. The Mountain Battalion was next assigned to the Isonzo front, in a mountainous area in Italy. The offensive, known as the Battle of Caporetto, began on 24 October 1917. Rommel's battalion, consisting of three rifle companies and a machine gun unit, was part of an attempt to take enemy positions on three mountains: Kolovrat, Matajur, and Stol. In two and a half days, from 25 to 27 October, Rommel and his 150 men captured 81 guns and 9,000 men (including 150 officers), at the loss of six dead and 30 wounded. Rommel achieved this remarkable success by taking advantage of the terrain to outflank the Italian forces, attacking from unexpected directions or behind enemy lines, and taking the initiative to attack when he had orders to the contrary. In one instance, the Italian forces, taken by surprise and believing that their lines had collapsed, surrendered after a brief firefight. In this battle, Rommel helped pioneer infiltration tactics, a new form of maneuver warfare just being adopted by German armies, and later by foreign armies, and described by some as Blitzkrieg without tanks. He played no role in the early adoption of Blitzkrieg in World War II though. Acting as advance guard in the capture of Longarone on 9 November, Rommel again decided to attack with a much smaller force. Convinced that they were surrounded by an entire German division, the 1st Italian Infantry Division – 10,000 men – surrendered to Rommel. For this and his actions at Matajur, he received the order of Pour le Mérite.