During the
Battle of Caporetto, from 24 October to 9 November 1917, the
Italian Army suffered over 300,000 casualties (dead, injured and captured) and was forced to withdraw, causing the replacement of the Italian Supreme Commander
Luigi Cadorna with General
Armando Diaz. Diaz reorganized the troops, blocked the enemy advance by implementing
defense in depth and mobile reserves, and stabilized the front line around the
Piave River. In June 1918, a large Austro-Hungarian offensive, aimed at breaking the
Piave River defensive line and delivering a decisive blow to the Italian Army, was launched. The
Austro-Hungarian Army tried on one side to force the
Tonale Pass and enter
Lombardy, and on the other side to make two converging thrusts into central
Venetia, the first one southeastward from the
Trentino, and the second one southwestward across the lower Piave. The whole offensive, which became known as the
Battle of the Piave River ended in a heavy defeat for the imperial army, with the Austro-Hungarians losing 11,643 killed, 80,852 wounded and 25,547 captured. On 1 November, the new Hungarian government of Count
Mihály Károlyi decided to recall all of the troops, who were conscripted from the territory of Kingdom of Hungary, which was a major blow for the Habsburgs' armies. After the Battle of the Piave, General Armando Diaz abstained from offensive action until Italy would be ready to strike with success assured. In the offensive he planned, three of the five armies lining the front from the
Monte Grappa sector to the
Adriatic end of the Piave were to drive across the river toward
Vittorio Veneto, so as to cut communications between the two Austrian armies opposing them. Allied forces totaled 57 infantry divisions, including 52 Italian, three British (
23rd,
7th and
48th), two French (23rd and 24th), and the
332nd US Infantry Regiment, along with supporting arms. The Austro-Hungarian army had 46 infantry divisions and six cavalry divisions, but both sides were ravaged by
influenza and
malaria and the Austrians only had 6,030 guns to Allied forces' 7,700. The Italian armies in the mountains were merely to hold the front line and follow up the enemy when it retreated. The task of opening the attack and taking on the strongest positions fell to the Fourth Army (Lieutenant-General
Gaetano Giardino) on the Grappa. The
Twelfth Army, consisting of one French and three Italian divisions, was commanded by the English-speaking Lieutenant-General
Enrico Caviglia and he had under his command the
Tenth Army (Lieutenant-General Lord
Cavan) to protect his right flank. Lord Cavan's army consisted of two British and two Italian divisions, and they too were expected to cross the Piave by breaking the Austrian defenses at Papadopoli Island. The
Third Army was simply to hold the lower Piave and cross the river when enemy resistance was broken. The Ninth Army, which contained two Italian divisions as well as the
6th Czechoslovak Division (consisting of former
POWs captured by the Italians), and the 332nd US Infantry Regiment, was held in reserve. The Allies had 600 aircraft (93 Anglo-French, including four
RAF squadrons) to gain complete
air superiority in the final offensive. ==Order of battle==