Defenders Day
Defenders Day is held on September 12. Maryland, United States. This event in the second decade of the month September is annual. 
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Defenders Day in Maryland commemorates the successful defense of the city of Baltimore from September 12-14, 1814, against invading British troops during the War of 1812. The event led to the writing of a poem, which was set to music and a few days later became known as the song "Star Ornament". It became the national anthem of the United States in 1931.
Similar holidays and events, festivals and interesting facts
Bolivian Soldier's Day on September 9
Commemoration of the mass hanging of the Saint Patrick's Battalion on September 12
Día de los Niños Héroes in Mexico on September 13 (in memory of 6 young Mexican cadets who died in the battle of September 13, 1847 during the Mexican-American War);
Infantry Day in Argentina on September 13
San Jacinto Day in Nicaragua on September 14
Day of the Tank Troops of Ukraine on September 14
Malaysian Armed Forces Day in Malaysia on September 16