 Twelve of its members of disease before the regiment returned home.Beginning in September 1864, Indianapolis was the site of the trials by a military commission of several men accused and convicted of treason.In a landmark civil liberty case that became known as "Ex parte Milligan", the U.S. Supreme Court overturned the convictions, On April 3, 1866, the Court ruled that the military trial was illegal because the civilian courts were open and functioning during the war.