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).