Betty,this is another report,"A Compendium of the War of the Rebellion" by Frederick H. Dyer ... 38th Regiment Indianna Infantry very simular to A.G.Report

Organized at New Albany, Ind., and mustered in September 18, 1861. Ordered to Elizabethtown, Ky., September 21, and duty at Camp Nevin on Green River until February, 1862. Attached to Wood's Brigade, McCook's Command, at Nolin, Ky., October-November, 1861. 7th Brigade, Army of the Ohio, to December, 1861. 7th Brigade, 2nd Division, Army of the Ohio, to March, 1862. 7th Independent Brigade, Army of the Ohio, to July, 1862. 9th Brigade, 3rd Division, Army of the Ohio, to September, 1862. 9th Brigade, 3rd Division, 1st Corps, Army of the Ohio, to November, 1862. 1st Brigade, 1st Division, Center 14th Army Corps, Army of the Cumberland, to January, 1863. 1st Brigade, 1st Division, 14th Army Corps, to April, 1864. 3rd Brigade, 1st Division, 14th Army Corps, to June, 1865. 1st Brigade, 1st Division, 14th Army Corps, to July, 1865.

SERVICE.--Advance on Bowling Green, Ky., and Nashville, Tenn., February 10-March 6, 1862. Moved to Franklin March 25, thence to Columbia and Shelbyville. Duty at Shelbyville until May 11. Action at Rogersville May 13. Expedition to Chattanooga May 28-June 16. Chattanooga June 7. Guard duty at Shelbyville and Stevenson until August. Moved to Dechard August 17, thence march to Louisville, Ky., in pursuit of Bragg, August 21-September 26. Pursuit of Bragg into Kentucky October 1-15. Battle of Perryville October 8. March to Nashville, Tenn., October 16-November 7, and duty there until December 26. Advance on Murfreesboro December 26-30. Battle of Stone's River December 30-31, 1862, and January 1-3, 1863. Duty at Murfreesboro until June. Middle Tennessee or Tullahoma Campaign June 24-July 7. Hoover's Gap June 24-26. Occupation of Middle Tennessee until August 16. Passage of the Cumberland Mountains and Tennessee River and Chickamauga (Ga.) Campaign August 16-September 22. Davis Cross Roads, Dug Gap, September 11. Battle of Chickamauga September 19-21. Rossville Gap September 21. Siege of Chattanooga, Tenn., September 24-November 23. Chattanooga-Ringgold Campaign November 23-27. Lookout Mountain November 23-24. Mission Ridge November 25. Pea Vine Creek and Graysville November 26. Ringgold Gap, Tay1or's Ridge, November 27. Duty at Rossville, Ga., and Chattanooga, Tenn., until February, 1864, and at Tyner's Station and Graysville until May. Atlanta (Ga.) Campaign May 1 to September 8. Demonstration on Rocky Faced Ridge May 8-11. Buzzard's Roost Gap May 8-9. Battle of Resaca May 14-15. Advance on Dallas May 18-25. Operations on 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. Ruff's Station, Smyrna Camp Ground, July 4. Chattahoochee River July 5-17. 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. Battle of Jonesboro August 31-September 1. Pursuit of Hood into Alabama October 3-26. March to the sea November 15-December 10. Siege of Savannah December 10-21. Campaign of the Carolinas January to April, 1865. Averysboro, N. C., March 16. Battle of Bentonville March 19-21. Occupation of Goldsboro March 24. Advance 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 20. Grand Review May 24. Moved to Louisville, Ky., June, and there mustered out July 15, 1865.
Regiment lost during service 9 Officers and 147 Enlisted men killed and mortally wounded and 1 Officer and 254 Enlisted men by disease. Total 411.

Battle of Nashville Dec.15-16,1864.Official records state the IV corps was involved Dec.15 pursued Hood for ten days till Hood crossed the Tennesee River.
A.G.report:Apr.1864 transfered to 3rd Brigade, 1st Division, 14th Army Corps, to June, 1865.
There seems to be a reorganizing of the 14th corps. in fall of 1864 because many of the original regiments term of enlistment was up.38th mustered September 18, 1861 for three years.Your kin would have been a new recruit mustering in Sept. of 64.Many went home some veteranized.Notice time lapps between Sept.1 and Oct. 3rd.
Oct. and Nov. of 1864 the 14th corps was involved with chasing Hood in N.GA. and ALA.He might of been wounded then or just sick. It is amazing how many casualties come from recruits not adjusting to camp life in the south or anywhere for that matter.In this case(38IND.) 1 Officer and 254 Enlisted men by disease.
I can't explain as I don't know this specific regiment other than what is in A.G. report of the unit. Certain companies might have been detached.
Nashville had several large hospitols.He could of been judged well enough to attempt to catch up with his regiment then in GA..Brideport is on the way from Nashville headed to Atlanta,and it was decided he couldn't contiue returning to Nashville.
Or released from hospitol and chased Hood ending up at Bridgeport(On TN.River)sick again.Who knows?
With all this I searched Soldiers and Sailors System ,NARA,and it does have a
Jacob Schneider,38IND.Inf.Co.B
John George Schneider,38IND.Inf.Co.B.
Any relation?
Joseph N.Schneider(alt. spelling Snyder)14IND.Inf.Co.E,this regiment was in the eastern Campaigns,mustered out June of 1864 balance transfered to 20IND.also in eastern campaigns.
There are seven men listed in the Joseph (Snyder) spelling from Indianna,none in the 38th...
Do any of these ring a bell!Good luck!