They went on to Antietam, but fighting there had already subsided. Next they went to Fredericksburg where they did engage briefly in battle. All of this troop movement occurred during "inclement weather" and terrible, muddy conditions. Typhoid often was a problem.
Samuel P. Bates, in History of the Pennsylvania Volunteers, 1861-1865, includes a report on the battle by General E. B. Tyler: "The One Hundred and Thirty-fourth under Colonel Edward O'Brien was second in line, and no set of men could have behaved better. The officers, one and all following the example of their Colonel, who was constantly on the alert, were very active, and not a man shirked his duty."
Bates also writes that "The loss in the engagement was forty-eight men killed, wounded and missing. Captain John Brant was among the killed. After the battle, the regiment returned to its former camp, and a few days thereafter, its term of service having expired, was ordered back to Harrisburg, where, on the 26th of May, it was mustered out of service." In other words, John was just two week from returning home.
Adding to the tragedy, John's wife Margaret and daughter Anna died less than a year later, leaving Isabella, Charles and Horace without parents.
The graves of John, Margaret and Anna, along with John's mother Ruth, are located in the Zion Baptist Church Cemetery, Worth Township, Butler County, Pennsylvania.