Battle of Culpeper Court House (September 13); the Bristoe Campaign (October 9–22), which included the First Battle of Auburn (October 13) and the Battle of Bristoe Station (October 14); and the Mine Run Campaign (November 26 – December 2). Engaged with his regiment in Kilpatrick's Raid on Richmond from February 28 through March 4, 1864, Rohm continued to help call and direct his fellow 16th Pennsylvania Cavalrymen in battle as chief bugler for his regiment during the Battle of the Wilderness (May 5–8) as part of Union Lt. General Ulysses S. Grant's Overland Campaign, and during Major-General Philip H. Sheridan's raids along the James River (May 9–14), including the battles of Yellow Tavern (May 11) and Totopotomoy Creek (May 2 –31). Continuing to fight with his regiment during Grant's Overland Campaign in the Battle of Haw's Shop (May 28), Rohm then also called the 16th Pennsylvania to battle at Cold Harbor (May 31 – June 1), Trevilian Station (June 11–12) and Saint Mary's Church (June 24). Next engaged with his regiment during the Siege of Petersburg from July 1864 to April 1865, Rohm bugled the 16th Pennsylvania Cavalry into fighting positions during the First and Second Battles of Deep Bottom (July 27–29 and August 14–20). On August 25, 1864, he then performed the act of valor for which he would later be awarded the U.S. Medal of Honor. While serving as the chief bugler for the 16th Pennsylvania Cavalry during the Second Battle of Ream's Station, Virginia on August 25, 1864, he "remained behind to succor a wounded officer, (Colonel James Addams Beaver of the 148th Pennsylvania Infantry), who was in great danger, secured assistance, and removed the officer to a place of safety" as his regiment retreated under heavy enemy fire. Interviewed later in life about his actions that day, Rohm recalled: The evening before the battle we had quite a conflict with Gen. Hill's corps, which was massing in front of us. We kept a sharp lookout, expecting a hot fight the next day. And sure enough, our expectations were realized. The following morning, after a great deal of maneuvering and picketing, the enemy attacked us with a regiment of cavalry. We were apprised of the attack in advance by our pickets and by forming quickly we were able to repulse them. The [officer] who led the charge was killed and his men driven back into the lines.