Beckelhimer enlisted in August 1862 into Company "B" of the 59th Ohio Infantry.  He was listed as a Prisoner of War on September 20, 1863 at Chickamauga, Georgia.  He mustered out in June, 1865.

History of the 59th Ohio Infantry

Organized October 1, 1861, under Colonel J.P. Fyffe, it went into the field soon after under General Nelson in Eastern Kentucky. In December it joined Buell's army, and in the spring of 1862 moved to the relief of Grant at Shiloh, fighting through the whole of the second day. It participated in the siege of Corinth, and after the evacuation marched into Northern Alabama. In August it began its race with Bragg through Tennessee and Kentucky, reaching Louisville September 25th, and again pursued Bragg southward, participating in the battle of Stone River. It opened the fight at Chickamauga and contested every inch of ground against overwhelming numbers. In November the Regiment assaulted Mission Ridge, and afterwards marched for Knoxville. It joined Sherman's Atlanta campaign in the spring of 1864, taking active part in all the battles and skirmishes to the end. Its three years term having expired in September, it was ordered to Nashville, where the men were mustered out October 31, 1864.

From Dyer's Compendium

59th Regiment Infantry. Organized at Ripley, Ohio, September 12, 1861. Moved to Maysville, Ky., October 1. Nelson's Campaign in Kentucky October-November. Action at West Liberty October 21. Olympian Springs November 4. Ivy Mountain November 8. Piketown November 8-9. Moved to Louisa, thence to Louisville and to Columbia, Ky., December 11. Attached to 11th Brigade, Army of the Ohio, to December, 1861. 11th Brigade, 1st Division, Army of the Ohio, to March, 1862. 11th Brigade, 5th Division, Army of the Ohio, to September, 1862. 11th Brigade, 5th Division, 2nd Corps, Army of the Ohio, to November, 1862. 2nd Brigade, 3rd Division, Left Wing 14th Army Corps, Army of the Cumberland, to January, 1863. 2nd Brigade, 3rd Division, 21st Army Corps, Army of the Cumberland, to October, 1863. 3rd Brigade, 3rd Division, 4th Army Corps, Army of the Cumberland, to September, 1864. Unattached, 4th Division, 20th Army Corps, Dept. of the Cumberland, to October, 1864. Tullahoma, Tenn., Defences of Nashville & Chattanooga Railroad, Dept. of the Cumberland, to October, 1864.
SERVICE.--Duty at Columbia, Ky., December 11, 1861, to February 15, 1862. March to Bowling Green, Ky., thence to Nashville, Tenn., February 15-March 8. March to Savannah, Tenn.; March 18-April 6. Battle of Shiloh, Tenn., April 6-7. Advance on and siege of Corinth, Miss., April 29-May 30. Occupation of Corinth May 30, and pursuit to Booneville May 31-June 12. March to Stevenson, Ala., via Iuka, Miss., Tuscumbia, Florence, Huntsville and Athens, Ala., June 12-July 24; thence to Battle Creek and duty there till August 20. March to Louisville, Ky., in pursuit of Bragg August 20-September 26. Pursuit of Bragg into Kentucky October 1-22. Battle of Perryville October 8 (Reserve). Nelson's Cross Roads October 18, March to Nashville, Tenn., October 22-November 7, and duty there till December 26. Advance on Murfreesboro December 26-30. Battle of Stone's River December 30-31, 1862, and January 1-3, 1863. At Murfreesboro till June. Middle Tennessee (or Tullahoma) Campaign June 23-July 7. Occupation of Middle Tennessee till August 16. Passage of the Cumberland Mountains and Tennessee River and Chickamauga (Ga.) Campaign August 16-September 22. Battle of Chickamauga September 19-20. Siege of Chattanooga September 24-November 23. Chattanooga-Ringgold Campaign November 23-26. Orchard Knob November 23. Tunnel Hill November 24-25. Mission Ridge November 25. Pursuit to Graysville November 26-27. March to relief of Knoxville November 28-December 8. Operations in East Tennessee till April, 1864. Action at Charleston December 28, 1863 (Detachment). Atlanta (Ga.) Campaign May 1-September 8. Demonstrations on Rocky Face Ridge and Dalton May 8-13. Battle of Resaca May 14-15. Adairsville May 17. Near Kingston May 18-19. Near Cassville May 19. Advance on Dallas May 22-25. 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 10-14 Lost Mountain June 15-17. Assault on Kenesaw June 27. Ruff's Station July 4. Chattahoochie River July 5-17. Peach Tree Creek July 19-20. Siege of Atlanta July 22-August 25. Flank movement on Jonesboro August 25-30. Battle of Jonesboro August 31-September 1. Lovejoy Station September 2-6. Transferred to 23rd Army Corps and ordered to Tullahoma, Tenn., thence to Nashville, Tenn., October 24. Mustered out October 31, 1864. Regiment lost during service 2 Officers and 45 Enlisted men killed and mortally wounded and 1 Officer and 109 Enlisted men by disease. Total 157