The 20th Battery, Ohio Light Artillery, armed with four 3-inch rifles and two Napoleons, served in Dodge's Brigade, Johnson's Division, McCook's Corps under Captain Edward Grosskopff on September 19, 1863. Early that morning it left Catlett's Gap with its brigade and reached the battlefield by way of Crawfish Spring soon after noon. At about 1 p.m., as the brigade moved forward as the division reserve, the battery went into action and opened fire, but because it endangered Union lines it was ordered to the rear. It remained there until about 5 p.m., when it advanced to a clearing and then to this position and again opened on the enemy. After nightfall it fell back to the previously mentioned clearing and was then ordered to move still farther to the rear. While carrying out that order, it came under enemy crossfire, and one man and several horses were wounded. Soon afterward the battery joined the 5th Indiana Battery, and after the firing ended it encamped in the Kelly field behind the brigade.