World War I: With a brave action carried out into the waters of the Austro-Hungarian port of Pula, two officers of the Italian Regia Marina sink with a manned torpedo the enemy battleship SMS Viribus Unitis.

Pula, also known by its Italian name as Pola, is the largest city in Istria County, west Croatia, and the seventh-largest city in the country, situated at the southern tip of the Istrian peninsula in western Croatia, with a population of 52,220 in 2021. It is known for its multitude of ancient Roman buildings, the most famous of which is the Pula Arena, one of the best preserved Roman amphitheaters. The city has a long tradition of wine making, fishing, shipbuilding, and tourism. It was the administrative centre of Istria from ancient Roman times until superseded by Pazin in 1991.

The Regia Marina (RM) or Royal Italian Navy was the navy of the Kingdom of Italy from 1861 to 1946. In 1946, with the birth of the Italian Republic, the Regia Marina changed its name to Marina Militare.

SMS Viribus Unitis  was an Austro-Hungarian dreadnought battleship, the first of the Tegetthoff class. "Viribus Unitis", meaning "With United Forces", was the personal motto of Emperor Franz Joseph I.

November 1 is the 305th day of the year in the Gregorian calendar; 60 days remain until the end of the year.