Línea Gustav
On 22 January 1944, during the Italian Campaign of the Second World War, the Allies commenced Operation Shingle, an amphibious landing at Anzio in an attempt to outflank the formidable German defensive positions known as the Winter Line (also Gustave Line) and push toward Rome: Valmontone was an important objective on the way to Rome, in according to Operation Buffalo, May–June 1944.