Ralph was assigned as a Private to the 32nd Regiment, Maine Infantry, which was attached to 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Potomac (organized in Augusta, Maine, in March of 1864). The 32nd Regiment fought many battles that year, including the Battles of the Wilderness in May of 1864 and the siege of Petersburg (Virginia) in June. In December of 1864 the 32nd Regiment consolidated with the 31st Maine Infantry with whom the went on to fight in many battles until they were mustered out in July of 1865. Ralph Flint survived his service in the war and had achieved the rank of Corporal before retiring from the military and returning to Baldwin, Maine.
He married Sally Flint (a cousin several times removed) who bore him three sons. Only one son, Walter, went on to marry and have children of his own. Ralph died on June 13, 1902, in Baldwin, Maine, and is presumably buried there.