John Sedgwick was a teacher, a career military officer, and a Union Army

Union Army

The Union Army was the land force that fought for the Union during the American Civil War. It was also known as the Federal Army, the U.S. Army, the Northern Army and the National Army...

 general in the American Civil War

American Civil War

The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

. He was the highest ranking Union casualty in the Civil War, killed by a sniper

Sniper

A sniper is a marksman who shoots targets from concealed positions or distances exceeding the capabilities of regular personnel. Snipers typically have specialized training and distinct high-precision rifles....

 at the Battle of Spotsylvania Court House

Battle of Spotsylvania Court House

The Battle of Spotsylvania Court House, sometimes simply referred to as the Battle of Spotsylvania , was the second major battle in Lt. Gen. Ulysses S. Grant's 1864 Overland Campaign of the American Civil War. Following the bloody but inconclusive Battle of the Wilderness, Grant's army disengaged...

.
Sedgwick was born in the Litchfield Hills

Litchfield Hills

The Litchfield Hills is a geographic region of the U.S. state of Connecticut located in the northwestern corner of the state. It is a term that is roughly coterminous with the boundaries of Litchfield County, for which it is named...

 town of Cornwall, Connecticut

Cornwall, Connecticut

Cornwall is a town in Litchfield County, Connecticut, United States. The population was 1,434 at the 2000 census.In 1939 poet Mark Van Doren wrote "The Hills of Little Cornwall", a short poem in which the beauties of the countryside were portrayed as seductive:The town was also home to the Foreign...

. He was named after his grandfather, John Sedgwick (brother of Theodore Sedgwick

Theodore Sedgwick

Theodore Sedgwick was an attorney, politician and jurist, who served in elected state government and as a Delegate to the Continental Congress, a US Representative, and a United States Senator from Massachusetts. He served as the fifth Speaker of the United States House of Representatives...

), an American Revolutionary War

American Revolutionary War

The American Revolutionary War , the American War of Independence, or simply the Revolutionary War, began as a war between the Kingdom of Great Britain and thirteen British colonies in North America, and ended in a global war between several European great powers.The war was the result of the...

 general who served with George Washington

George Washington

George Washington was the dominant military and political leader of the new United States of America from 1775 to 1799. He led the American victory over Great Britain in the American Revolutionary War as commander-in-chief of the Continental Army from 1775 to 1783, and presided over the writing of...

. After teaching for two years, he attended the United States Military Academy

United States Military Academy

The United States Military Academy at West Point is a four-year coeducational federal service academy located at West Point, New York. The academy sits on scenic high ground overlooking the Hudson River, north of New York City...

, graduated in 1837 ranked 24th of 50, and was commissioned a second lieutenant in the U.S.