James “Jim” McMullen was William’s main companion at the Indiana 10th. He and William were essentially brothers-in-law, having married Hubbard sisters Sarah and Julia. Jim McMullin was born August 1841 but there is no exact date and no information available at this time on his parents. He and Julia married on October 3, 1861 and had no children at the time of his enlistment.
It is interesting to note that unlike James Grigg and William Forder, Jim McMullen’s occupations on the census records do NOT include smithing as an occupation. Instead, he has been listed as being a butcher, a janitor at a school house, and a mail carrier. However, these come from post war census records, so perhaps at one time he was a blacksmith as well. Or perhaps he opted to accompany his good friend and brother-in-law to war with the Indiana 10th.