Mediterranean & North Africa · 17 Jan 1944 – 18 May 1944
Battle of Monte Cassino
Four Allied offensives against the Gustav Line at Monte Cassino ended with German withdrawal and the Polish II Corps entering the monastery ruins on 18 May 1944.
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The Battle of Monte Cassino comprised four Allied offensives against the western anchor of the Gustav Line. The German position covered the Rapido and Liri valleys and the approaches to Route 6, the main road north toward Rome. Monte Cassino and its monastery overlooked Cassino and the valley entrances. The fighting took place in steep terrain, across rivers and through a town that became heavily damaged. [Source 1](https://en.wikipedia.org/wiki/Battle_of_Monte_Cassino) [Source 6](https://assets.publishing.service.gov.uk/media/5a79ed35ed915d042206c0aa/ww2_montecass.pdf)
The first offensive opened on 17 January. British X Corps crossed the Garigliano, while the U.S. 36th Infantry Division’s crossing of the Rapido on 20 January was repulsed with heavy losses. On 24 January, U.S. II Corps attacked north of Cassino; French forces also fought on the mountainous flank. The Allies gained ground near the town and toward the monastery but failed to capture the heights. The assault ended on 11 February. [Source 1](https://en.wikipedia.org/wiki/Battle_of_Monte_Cassino) [Source 5](https://ww2db.com/battle_spec.php?battle_id=312)
The second offensive followed the bombing of the monastery on 15 February. Allied commanders had believed the abbey was being used by German forces; German paratroopers occupied the ruins after the bombing and made them part of their defences. Indian and New Zealand troops attacked the Cassino heights and railway station, but German resistance stopped the advance. The attack ended on 18 February without taking the position. [Source 3](https://www.britannica.com/event/Battle-of-Monte-Cassino) [Source 5](https://ww2db.com/battle_spec.php?battle_id=312)
The third offensive began on 15 March with a heavy bombardment of Cassino. New Zealand and Indian troops made gains, including positions near the monastery and the town, but rain, damaged streets and German counterattacks hindered further progress. The Allies paused the attack on 23 March. The fourth offensive, Operation Diadem, began on the night of 11–12 May. British, Indian, Polish, American and French troops attacked across a broad front, and the Canadians followed into the Liri valley from 15 May. French forces pressed through the Aurunci Mountains, while the Polish II Corps attacked the heights north of Cassino. [Source 5](https://ww2db.com/battle_spec.php?battle_id=312) [Source 9](https://www.bbc.co.uk/history/ww2peopleswar/timeline/factfiles/nonflash/a1057664.shtml)
German forces withdrew from the Gustav Line as the final offensive developed. On 18 May, Polish troops entered the monastery ruins, where they found the position largely abandoned. The capture opened the way for the Allied advance, although the Germans continued to withdraw to prepared lines farther north. Estimates of total casualties varied substantially across the sources: Allied losses were reported as 55,000–105,000, and German losses as approximately 20,000–80,000. [Source 1](https://en.wikipedia.org/wiki/Battle_of_Monte_Cassino) [Source 3](https://www.britannica.com/event/Battle-of-Monte-Cassino)