Edition No. 48 · GlobalEst. 2026
PLANET EARTH NEWS
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This Day in History

This Day in History: September 11

Test your historical knowledge with these five questions highlighting key moments that occurred on September 11 across different eras and continents.

Date: 2026-09-11

1. In the year 9 CE, which historic four-day confrontation in ancient Germany concluded on September 11, stopping Roman expansion east of the Rhine River?

2. On September 11, 813, which Frankish ruler crowned his son, Louis the Pious, as co-emperor of the Carolingian Empire?

3. During the Crimean War, an 11-month siege ended on September 11, 1855, when British and French allied forces captured which fortified Black Sea naval base?

4. On September 11, 1941, ground was broken in Arlington County, Virginia, to begin construction on which prominent military headquarters building?

5. On September 11, 1944, British Prime Minister Winston Churchill and United States President Franklin D. Roosevelt opened their second major wartime summit in which Canadian city?