The shelling of Zugna Torta was renewed on May 17, 1916, when five attacks against the Italian positions were repulsed with heavy losses. Meanwhile artillery fire continued against the Italian positions between Val Terragnolo and the upper Astico.
But though spectacular, the results were of comparatively small importance. About May 15, 1916, the Italians were at the gates of Rovereto, less than twelve miles south of Trent and seriously threatening that city. East of Rovereto the Italian lines ran along the crest of Doss di Somme to the Monte Maggio beyond Val Terragnolo and then northward to Soglio d'Aspio.
In the zone between the Val Terragnolo and the upper Astico a violent concentrated fire from the Austrian artillery of all calibers forced the Italians to abandon their advanced positions. In the Asiago sector persistent attacks were repulsed. In the Sugana Valley the Austrians vigorously attacked between the Val Maggio bridgehead and Monte Collo.
The Austrian advance was well maintained on the following day, May 19, 1916, when the Italians were driven from their positions on the Col Santo, almost directly to the west of Monte Maggio captured the day before, between the Val di Terragnolo and the Vallarsa.
The troops attacked en masse, and at the same time attacks were made from the Adige to the Val Sugana. Four onslaughts were made on Zugna Torta. Our machine guns cut down the blue masses of men; the wire entanglements were heaped with dead. The bombardment had destroyed all the first-line trenches. The infantry then hurled itself against the advance posts of the Val Terragnolo.