Hall raced through flames across the parade ground (permanently burning off his eyebrows) to save the flag, and, with the help of two fellow artillerists, replaced the pole and again hoisted "Old Glory" over the battered fort.
When Major Robert Anderson evacuated the fort, Hall returned home to Monroe Michigan, where he was instrumental in recruiting volunteers for the Army.
He left in July 1862 to accept a commission as colonel of the 7th Michigan Infantry, leading it during the Second Battle of Bull Run and the Maryland Campaign.
Maj. Gen. Ambrose Burnside, commander of the Army of the Potomac, asked for volunteers for the dangerous task of leading troops across pontoon bridges to seize the town.
However, sharpshooters prevented the completion of the bridge, and when presented with the new situation, Lt. Col. Henry Baxter of the 7th Michigan Volunteer Infantry agreed to lead the regiment across in boats under heavy fire.
The exploit was successful, allowing the sharpshooters to be cleared from the opposite river bank long enough for the bridge to be completed and the rest of the brigade to cross and enter the battle.
Hall's Brigade was rushed in as reinforcements to close a critical breach in the Union line and thus, contributed greatly to the victory.
In recognition for his service at Gettysburg, Hall received his third citation for gallantry, and was promoted to the rank of captain in the regular army on August 1, 1863.
He was buried in Section 30, Row I, Grave 373 of the Post Cemetery at the United States Military Academy at West Point, New York.