I saw this gravestone while at Mt. Hope Cemetery today in Rochester, NY. I Googled him and found the below information:

Off Indian Trail is a gravestone that attracts the interest of many tour members. The sculpted symbolism identifies George B. Grover as an artillery man, and the streamer from the cannon lists his unit as the 18th N.Y. Battery. While the entire motif symbolizes the cut-off of life, the broken wheel is frequently associated with a premature death.

George B. Grover enlisted in Capt. Albert B. Mack's Rifle Batt'y, 108th Regiment N.Y. Vols. in September 1862, a unit that was subsequently reorganized as the 18th Independent Battery N.Y. Light Artillery (Mack's Battery). In December 1862 the battery left Rochester for Louisiana. In March 1863, Grover entered the New Orleans Marine U.S.A. General Hospital suffering from diphtheria, and remained there until his disability discharge in June 1863. During the Civil War, disease often reduced a regiment's size considerably before it ever went into battle. Twice as many men died from disease as were killed on the battlefield or died from wounds.

A death notice in the Union and Advertiser and the inscription on his gravestone complete the story. Grover died enroute home aboard the U.S. Transport Matanzas, on June 15, 1863, aged 24 years, from diphtheria. "He was buried at sea." The memorial stone stands in the family lot.
The copyright for all Epitaph texts herein is held by the Friends of Mount Hope Cemetery.