Captain Bentley enlisted in Company H, 21st Infantry Regiment of Wisconsin on August 26, 1862. He was killed in battle at Perryville Kentucky.
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The following was contributed by member 47892259:
Janesville Gazette, Oct 29, 1862

Arrival of the Body of Cap. Bentley
The body of Capt. Bentley arrived today, and has been deposited in the cemetery vault. The funeral services will be preformed at the Congregational church next Sabbath at half-past 1 o'clock.

Janesville Gazette, Nov 3, 1862

Funeral of Capt. Bently
The funeral rights of Capt. Bentley took place yesterday, and we have seldom witnessed a more impressive ceremonial. A portion only of the participants were able to get into the church, where services were held by the Rev. Kinney, who preached an able sermon, enforcing an overflow. Providence wisely directs and controls the affairs of men and nations. In it, he gave a brief history of Capt. Bentley, and the circumstances surrounding his death. We understand that this sermon is to be published in pamphlet form, and we shall transfer to our columns, that portion relating personally to Capt. B. The procession, which was very large, formed in the following order;

1. Music, Chicago Light Guard Band
2. Military escort
3. Clergy
4. Hearse and bearers
5. Mourners
6. Procession of railroad men and citizens on foot and carriage

A special train from Chicago brought Mr. Smith, the acting President of C. and N.W. Railway, Mr. Dunlap, the general superintendent, Messers. Tiffany, Canbridge and other conductors, and many employees of the company, personal friends of Capt. Bentley, the engine of the train being dressed in mourning.

The sword being worn by Capt. B. in the battle where he so bravely met the enemies of his country, was placed on the hearse, stained with the blood it drew on the battle field.

The services at the grave were of usual military character and were under the charge of Lieut. Aiken.

The offices of the company of which Capt. B. was so long and honorably connected, have been unremitting in their efforts to obtain the body for burial by his friends at his own home, and we understand, plan to erect a monument to his memory. Their effort could not have been more deservedly given, or their liberality more worthily bestowed.
The 21st Regiment, Wisconsin Infantry was organized at Oshkosh, Wis., and mustered in September 5, 1862. Left State for Cincinnati, Ohio, September 11, thence to Covington, Ky., and to Louisville, Ky., September 15. Duty in the fortification of Louisville September 18-October 1. Attached to 28th Brigade, 3rd Division, Army of the Ohio, September, 1862. 28th Brigade, 3rd Division, 1st Army Corps, Army of the Ohio, to November, 1862. 3rd Brigade, 1st Division, Centre 14th Army Corps, Army of the Cumberland, to January, 1868. 3rd Brigade, 1st Division, 14th Army Corps, Army of the Cumberland, to April, 1863. 2nd Brigade, 1st Division, 14th Army Corps, to April, 1864. 1st Brigade, 1st Division, 14th Army Corps, to June, 1865.

SERVICE.-Pursuit of Bragg to Crab Orchard, Ky., October 1-16, 1862. Perryville , Ky., October 8. Guard duty at Mitchellsville till December 7. Moved to Nashville, Tenn., and duty there till December 26. Advance on Murfreesboro December 26-30. Jefferson December 30. Battle of Stone River , December 30-31, 1862, and January 1-3, 1863. Duty at Murfreesboro till June. Expedition to McMinnville April 20-30. Middle Tennessee (or Tullahoma) Campaign June 23-July 7. Hoover's Gap , June 24-26. Occupation of Middle Tennessee till August 16. Passage of the Cumberland Mountains and Tennessee River and Chickamauga (Ga.) Campaign August 16-September 22. Davis Cross Roads , near Dug Gap, September 11. Battle of Chickamauga, September 19-21. Rossville Gap September 21. Siege of Chattanooga September 24-November 23. Chattanooga-Ringgold Campaign November 23-27. Orchard Knob November 23-24. Mission Ridge November 25. Reconnoissance to Cooper's Gap November 30-December 3. Atlanta (Ga.) Campaign May 1 to September 8, 1864. Demonstrations on Rocky Faced Ridge , May 8-11. Battle of Resaca , May 14-15. Advance on Dallas May 18-25. Operations on line of Pumpkin Vine Creek and battles about Dallas , New Hope Church and Allatoona Hills May 25-June 5. Pickett's Mills May 27. Operations about Marietta and against Kenesaw Mountain June 10-July 2. Pine Hill, June 11-14. Lost Mountain June 15-17. Assault on Kenesaw June 27. Run's Station July 4. Chattahoochie River July 5-17. Buckhead, Nancy's Creek, July 18. Peach Tree Creek , July 19-20. Siege of Atlanta July 22-August 25. Utoy Creek , August 5-7. Flank movement on Jonesboro August 25-30. Near Red Oak August 29. Battle of Jonesboro , August 31-September 1. Operations against Hood in North Georgia and North Alabama September 30-November 3 March to the sea November 15-December 10. Siege of Savannah December 10-21. Campaign of the Carolinas January to April, 1865. Taylor's Hole Creek, Averysboro , N. C., March 16. Battle of Bentonville, March 19-21. Occupation of Goldsboro March 24. Advanace on Raleigh April 10-14. Occupation of Raleigh April 14. Bennett's House April 26. Surrender of Johnston and his army. March to Washington, D. C., via Richmond, Va., April 29-May 17. Grand Review May 24. Mustered out June 8 and discharged from service June 17, 1865.

Regiment lost during service 5 Officers and 117 Enlisted men killed and mortally wounded and 3 Officers and 180 Enlisted men by disease. Total 305.

Captain Bentley, the Commanding officer of Company B, 21st Wisconsin Infantry died on "Starkweather Hill" during the Battle of Perryville, Kentucky, as the men of the 21st attempted to defend the 12 guns of Colonel John C. Starkweather's two artillery batteries. The men of the 1st Tennessee Infantry had inched their way to the top of the hill, where a hand-to-hand fight erupted among the wheels of the guns. One Union artilleryman noted that the ground became literally slippery with blood as the contending armies grappled around the pieces. Captain George Bentley of Company B, 21st Wisconsin, ran a Confederate through with his sword, picked up that Southerner's gun and shot another. He was then shot dead. All officers of the 21st Wisconsin, including Cpt. Bentley, were killed wounded, or taken prisoner that day. This was the first fight for the 21st, and they lost heavily that day.