1. The Battle of Brandywine: On September 26, 1777, American forces under General George Washington were defeated by the British at the Battle of Brandywine, which took place near Chadds Ford, Pennsylvania. This battle is considered a turning point in the Revolutionary War, as it allowed the British to capture Philadelphia.

2. Constitution of Delaware: On September 26, 1776, the constitutional convention of Delaware adopted the state's first constitution. This document outlined the state's government structure and provided basic rights for the state's citizens.

3. Birth of T. Coleman du Pont: On September 26, 1863, T. Coleman du Pont was born in Wilmington, Delaware. He would go on to become a prominent businessman and philanthropist, and his legacy is still felt throughout the state today.

4. Bonnie and Clyde's Shootout: On September 26, 1933, notorious outlaws Bonnie Parker and Clyde Barrow were involved in a shootout with police near Sowersville, Delaware. Although the incident didn't result in any fatalities, it did increase the public's interest in the criminal couple.

5. University of Delaware Founded: On September 26, 1743, a group of intellectuals in Newark, Delaware established what would eventually become the University of Delaware. Originally known as the Newark College, the institution has grown in size and scope over the years, and is now one of the top public universities in the nation.