 Complete the following phrase:  1861, he volunteered as a Private in Company B, in Terrys Texas Rangers, of the Confederate States of America army. On April 67, 1862, he participated in the Battle of Shiloh in Tennessee and in the campaigns about Richmond, Virginia. He became a Lieutet and served as an aide on the staff of his cousin, General Lloyd Tilghman who was killed in front at the Battle of Champion Hill. On March 14, 1863, Oswald took active part, with his battery, in that led to the destruction of the United States steam frigate USS Mississippi 1841, of which Admiral George Dewey was then executive officer, when Admiral Farraguts fleet attempted to pass the Confederate batteries. For his bravery on this occasion, he was commended by Lieutet Colonel de Gournay, who commanded the left wing of the Confederate batteries. During the Siege of Port Hudson in Louisiana, Lieutet Oswald Tilghman commanded the Rock City artillery of Nashville, Tennessee, a heavy battery on the banks of the Mississippi River and was the only one of the four officers of that battery who survived the siege. Lieut. Oswald Tilghman was taken captive during May 22  July 9, 1863 at the 