Jacob served in the Civil War, apparently under the alias William Cline, before he married my great-grandfather's sister. When he was 19, he first enlisted in the Maryland Infantry and was shot in his left forearm 18 months later. After he mustered out, Jacob then enlisted in the Navy. He was honorably discharged almost 4 years later in 1869.
Although Jacob spent time in Maryland both before and after his military service, he ended up in Pittsburgh sometime between the 1870 census and his marriage in 1872. He ran the bar that was previously owned by his father-in-law and was the father of 2 boys who both died before they reached their fourth birthdays.
Jacob's obituary appeared in a German newspaper, Pittsburger Volksblatt, on November 7, 1887. Unfortunately, I don't know what it says. I can make out bits and pieces but am curious as to whether it may contain any clues about him that I don't already know. I see that it says something about Baltimore near the end, which is where his brother Frank Nehren lived.