Focal points of the underground fighting during the War in the Dolomites were Pasubio with 10 mines, Lagazuoi with 5, Col di Lana/Monte Sief also with 5, and Marmolada with 4 mines. The most intense episode was the seven-week period from 16 September to 3 November 1917 which saw 12 mine explosions. After November 1917 and the Italian retreat to Monte Grappa and the Piave river in the aftermath of the Battle of Caporetto, Pasubio with its elevation of remained the only underground war area on the Austro-Italian front.