1. The Treaty of Hartford was signed on October 31, 1638 between the English settlers in Connecticut and the Pequot tribe. This treaty ended the Pequot War, which was the first major conflict between Europeans and Native Americans in New England.

2. On October 31, 1861, the first warship built by the US Navy for the Civil War, the USS Ino, was launched from Mystic, Connecticut. The Ino played an important role in the Union blockade of Confederate ports.

3. In 1905, the first motorized fire truck was put into service in New Britain, Connecticut on October 31. This truck was a significant improvement over the previous horse-drawn wagons and helped the fire department respond more quickly to emergencies.

4. On October 31, 1937, the infamous Hurricane of '38 struck Connecticut, causing widespread damage and claiming the lives of more than 50 people. This hurricane was one of the most destructive and deadly storms in US history.

5. In 1955, the Hartford Symphony Orchestra made its debut on October 31 with a performance at the Bushnell Memorial Theater. Today, the orchestra is recognized as one of the premier musical organizations in the region, and continues to perform to audiences in Connecticut and beyond.