Henry O'Brien (colonel)

Henry O'Brien was a United States Army officer who served during the American Civil War. He is best known for his actions at the Battle of Gettysburg, where he commanded the 1st Delaware Infantry.

O'Brien was born in Ireland and immigrated to the United States as a young man. He settled in Delaware and worked as a silversmith before the outbreak of the Civil War.

Upon the start of the war, O'Brien enlisted in the 1st Delaware Infantry, eventually rising to the rank of colonel. He led his regiment with distinction throughout the war, participating in several major battles, including Antietam, Fredericksburg, and Chancellorsville.

His most notable service came at Gettysburg on July 2, 1863. The 1st Delaware was positioned on Cemetery Ridge and faced a determined attack by Confederate forces. O'Brien rallied his men and held their position, helping to repulse the Confederate advance and contributing to the Union victory. He was severely wounded during the battle.

For his bravery and leadership at Gettysburg, O'Brien was awarded the Medal of Honor. The citation reads: "Distinguished gallantry in leading his command into action and holding his position on the second day of Gettysburg."

After the war, O'Brien returned to Delaware and resumed his life as a silversmith. He died in 1878 and is buried in Wilmington, Delaware. His legacy is one of courage and dedication to duty.