By: History.com Editors

1940

Italy declares war on France and Great Britain

Published: November 16, 2009

Last Updated: January 24, 2025

On June 10, 1940, after withholding formal allegiance to either side in the battle between Germany and the Allies, Benito Mussolini, dictator of Italy, declares war on France and Great Britain.

What caused Il Duce’s change of heart? Perhaps the German occupation of Paris did it. “First they were too cowardly to take part. Now they are in a hurry so that they can share in the spoils,” reflected Hitler. (However, Mussolini claimed that he wanted in before complete French capitulation only because fascism “did not believe in hitting a man when he is down.”)

Italy’s lack of raw materials had made Mussolini wary of waging all-out war previously. Britain and France were also wooing him with promises of territorial concessions in Africa in exchange for neutrality. But the thought of its Axis partner single-handedly conquering the Continent was too much for his ego to bear. While Germany had urged Italy’s participation in September 1939, at this late date such intervention would probably prove more of a hindrance than a help. For example, despite Italy’s declaration of war on the 10th, it wasn’t until the 20th that Italian troops were mobilized in France, in the southwest-and easily held at bay by French forces.

The reaction by the Allies to the declaration of war was swift: In London, all Italians who had lived in Britain less than 20 years and who were between the ages of 16 and 70 were immediately interned. In America, President Roosevelt broadcast on radio the promise of support for Britain and France with “the material resources of this nation.”

Virginia Hall: The Most Feared Allied Spy of WWII

Learn how Virginia Hall, woman with a prosthetic leg, became the most feared allied spy in WWII. See how she eluded Nazi capture and aided in a victory at D-Day.

Timeline

Also on This Day in History

Discover more of the major events, famous births, notable deaths and everything else history-making that happened on June 10th

About the author

HISTORY.com works with a wide range of writers and editors to create accurate and informative content. All articles are regularly reviewed and updated by the HISTORY.com team. Articles with the “HISTORY.com Editors” byline have been written or edited by the HISTORY.com editors, including Amanda Onion, Missy Sullivan, Matt Mullen and Christian Zapata.

Fact Check

We strive for accuracy and fairness. But if you see something that doesn't look right, click here to contact us! HISTORY reviews and updates its content regularly to ensure it is complete and accurate.

Citation Information

Article title
Italy declares war on France and Great Britain
Website Name
History
Date Accessed
March 24, 2025
Publisher
A&E Television Networks
Last Updated
January 24, 2025
Original Published Date
November 16, 2009

History Every Day

Sign Up for "This Day in History"

Uncover fascinating moments from the past every day! Learn something new with key events in history, from the American Revolution to pop culture, crime and more.

By submitting your information, you agree to receive emails from HISTORY and A+E Global Media. You can opt out at any time. You must be 16 years or older and a resident of the United States.