On 29–30 June 1862, Battery F participated in a reconnaissance to Front Royal and Luray. The unit remained at Front Royal until August. Next, it served in John Pope's Northern Virginia campaign from 16 August to 2 September. At the start of the campaign, Battery F was assigned to Henry Bohlen's brigade which was part of Carl Schurz's 3rd Division in Franz Sigel's corps. In August, Lieutenant Joseph L. Miller joined Battery F with 50 men and two guns, raising the total number of guns from four to six. The battery fought at the Battle of Sulphur Springs on 24 August. At Freeman's Ford, Schurz sent Bohlen's three regiments across the Rappahannock River, hoping to catch Stonewall Jackson's wagon train. The Federals were suddenly attacked by Isaac R. Trimble's Confederate brigade which was soon joined by John Bell Hood's two brigades. Bohlen was killed; his troops were routed and chased across the river.