1. On April 5, 1639, the first meetinghouse of the town of Guilford was built. This building served as a gathering place for the town's residents and was also used for town meetings and religious services.

2. In 1765, the Connecticut Gazette, the state's first newspaper, was founded in New Haven. The newspaper covered local and national news, as well as articles on agriculture, commerce, and other topics.

3. On April 5, 1862, the Battle of Yorktown began during the American Civil War. The battle was part of the Peninsula Campaign, which aimed to capture the Confederate capital of Richmond. Connecticut soldiers fought alongside Union troops during this important battle.

4. In 1913, the Connecticut legislature passed a law allowing women to serve on school boards. This was an important step towards women's suffrage and equal representation in government.

5. On April 5, 1926, the Connecticut River Flood devastated towns along the Connecticut River. Heavy rains caused the river to overflow, leading to widespread flooding and property damage. The disaster led to new efforts to control flooding in the region.