He received the Medal of Honor for gallantry during the Battle of Gettysburg while defending the Union position on Cemetery Ridge against Pickett's Charge on July 3, 1863.

[1] Füger's five-year enlistment was set to expire in 1861 when Confederate forces fired during the Battle of Fort Sumter, the first engagement of the American Civil War.

During the Battle of Gettysburg in July 1863, Füger was defending Cemetery Ridge during the Confederate infantry assault known as Pickett's Charge.

After Lt. Alonzo Cushing and 2nd Lt. Joseph Milne were mortally wounded, Füger took command of the battery and continued to fire the single remaining gun under the pressure of approaching Confederates.

General Lewis Armistead managed to breach the stone wall, landing among the forward guns.