The 11th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War. It was originally formed as a three-month volunteer unit at the beginning of the war, and then reorganized as a three-year unit, in which role it served until the end of the war.

Can we draw the following conclusion?
The 11th Regiment Illinois Volunteer Infantry was an unit under the Union Army during the Civil War

Select from:
 (1). Yes;
 (2). It's impossible to say;
 (3). No;
(1).