 Complete the following phrase:  He was one of six siblings, and one of two sons to Major Gerhard L. Luhn and Catherine A. Oltmans. Gerhard had a distinguished career in the US army, serving for over forty years from 1852 to 1895. He fought in the Mormon War of 1858, against Sioux Native Americans in the 1870s, and most notably served under General George McClellan in the 