<human>:  What was the name of the regiment of the 7th Cavalry?
<bot>: The 7th Cavalry was a regiment of the United States Army. It was originally formed in 1866 as the 1st Cavalry Regiment, and was first commanded by Philip Sheridan. The 7th Cavalry was also known as the "Buffalo Soldiers", because the soldiers were recruited from the Buffalo Soldiers regiment. The Buffalo Soldiers were African American soldiers who fought in the American Civil War, and they are considered the first black military unit in the United States.