Grueb received his country's highest award for bravery during combat, the Medal of Honor.

[1] Grueb's medal was won for his capturing a flag at the Battle of Chaffin's Farm, Virginia on September 29, 1864.

[1][2] Grueb was born in Württemberg, Germany.

He joined the Army from Brooklyn in August 1862, and mustered out with his regiment in June 1865.

[1][3] The President of the United States of America, in the name of Congress, takes pleasure in presenting the Medal of Honor to Private George M. Grueb, United States Army, for extraordinary heroism on 29 September 1864, while serving with Company E, 158th New York Infantry, in action at Chapin's Farm, Virginia, for gallantry in advancing to the ditch of the enemy's works.