From Ancestry.com

American Civil War Soldiers
about Amos Miller
Name: Amos Miller ,
Occupation: Farmer
Enlistment Date: 16 Aug 1862
Enlistment Place: Scott, Virginia
Side Served: Confederacy
State Served: Virginia
Service Record: Enlisted as a Private on 16 August 1862 at the age of 27.
Commission in Company D, 25th Cavalry Regiment Virginia on 16 Aug 1862.

Sources: 21

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1850 United States Federal Census
about Amos Miller
Name: Amos Miller
Age: 15
Estimated birth year: abt 1835
Birth Place: Virginia
Gender: Male
Home in 1850(City,County,State): Western District, Scott, Virginia
Father - Daniel Miller - 41 - Farmer
Mother - Catherine - 33
Sister - Sophia - 12
Sister - Elizabeth - 8
Sister - Sarah - 4
Brother - John - 1.12
Grandfather - John - 80
Unknon Relation - Elizabeth Grose(?) - 18
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1860 United States Federal Census
about Amos Miller
Name: Amos Miller
Age in 1860: 25
Birth Year: abt 1835
Birthplace: Virginia
Home in 1860: Scott, Virginia
Gender: Male
Post Office: Estillville
Household Members: Name Age
Amos Miller 25
Mary A Miller 18
Francis E Miller 5.12
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1880 United States Federal Census
about Amos Miller
Name: Amos Miller
Home in 1880: Fulkerson, Scott, Virginia
Age: 45
Estimated birth year: abt 1835
Birthplace: Virginia
Relation to head-of-household: Self (Head)
Spouse's name: Mary A.
Father's birthplace: Virginia
Mother's birthplace: Virginia
Occupation: Farmer
Marital Status: Married
Race: White
Gender: Male
Household Members: Name Age
Amos Miller 45 - Farmer
Mary A. Miller 35 - Keeping House

Francis E. Miller 20 - Son - Farm Labor Single White Male

Sally C. Miller 17 - Daughter - Single White Female

Martha C. Miller 12 - Daughter - Single White Female

William A. Miller 10 - Son - Farm Labor Single White Male

Albert S. Miller 8 - Son - Single White Male

John Miller 1 - Son - Single White Male
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Daniel Miller
Born: 22 Apr 1809
[city], Scott, Virginia, USA
Died: 30 Mar 1863
[city], Scott, Virginia, USA
Family Groups
Spouse
Catherine Booher
Born: 21 Apr 1816 in [city], Scott, Virginia, USA
Died: 23 Feb 1864 in [city], Scott, Virginia, USA
Marriage: 15 Jul 1833 in [city], Scott, Virginia, USA View Info
Children Sex Birth
Amos Miller M 16 Aug 1834 in [city], Scott, Virginia, USA
Mary Ann Miller F 15 Jun 1836 in [city], Scott, Virginia, USA
Sophia S Miller F 26 Oct 1838 in [city], Scott, Virginia, USA
Elizabeth J Miller F 9 Jan 1842 in [city], Scott, Virginia, USA
Sarah S Miller F 30 Oct 1842 in [city], Scott, Virginia, USA
John Miller M 4 May 1850 in [city], Scott, Virginia, USA

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John Miller
Born: 8 Oct 1769
[city], York, Pennsylvania, USA
Died: 27 Jan 1858
[city], Scott, Virginia, USA
Catherine Teeter
Born: 20 Aug 1769
Died: 27 Aug 1849 in [city], Scott, Virginia, USA
Marriage: 31 May 1791 in [city], Washington, Virginia, USA View Info
Children Sex Birth
Phillip Miller M [city], Scott, Virginia, USA
John Miller M 1797 in [city], Scott, Virginia, USA
Polly Miller F 1799 in [city], Scott, Virginia, USA
Isaac Miller M 1800 in [city], Scott, Virginia, USA
Adam Miller M 23 Feb 1801 in [city], Scott, Virginia, USA
Jacob Miller M 1802 in [city], Scott, Virginia, USA
Sally Miller F 1804 in [city], Scott, Virginia, USA
Abraham Miller M 13 Feb 1805 in [city], Scott, Virginia, USA
David Miller M 1 Apr 1807 in [city], Scott, Virginia, USA
Elizabeth Miller F 1808 in [city], Scott, Virginia, USA
Daniel Miller M 22 Apr 1809 in [city], Scott, Virginia, USA
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Jacob Miller
Born: abt 1730
York, [county], Pennsylvania, USA
Died: 1781
Shenandoah, [county], Virginia, USA
Elizabeth
Born:
Died:
Marriage: 1754 in York, [county], Pennsylvania, USA View Info
Children Sex Birth
Adam Miller M 18 Jun 1760 in Washington, [county], Pennsylvania, USA
Mary Elizabeth Miller F 20 Jun 1760 in Hagerstown, [county], Maryland, USA
Philip Jacob Miller M abt 1764 in York, [county], Pennsylvania, USA
Eve Miller F 1766 in York, [county], Pennsylvania, USA
Mary Barbara Miller F 1767 in [city], York, Pennsylvania, USA
John Miller M 8 Oct 1769 in [city], York, Pennsylvania, USA
Sarah Miller F 1773 in Shenandoah, [county], Virginia, USA
Godfrey Miller M 1774 in North Sewickley Towship, Lancaster, Pennsylvania, USA
Elizabeth Miller F abt 1776 in [city], Shenandoah, Virginia, USA
Catherine Miller F abt 1780 in [city], Shenandoah, Virginia, USA
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
George Miller
Born: abt 1704
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++

NPS CWS&SS shows:

Amos Miller
Regiment Name 25th Virginia Cavalry
Side Confederate
Company D
Soldier's Rank_In 1 Lieutenant
Soldier's Rank_Out 1 Lieutenant
Film Number M382 roll 38

25th Regiment, Virginia Cavalry

25th Cavalry Regiment was organized in July, 1864, using the 27th Battalion Virginia Partisan Rangers as its nucleus. Serving in McCausland's and Imboden's Brigade, the unit fought in numerous engagements in western Virginia and the Shenandoah Valley. During April, 1865, it disbanded. Its commanders were Colonel Warren M. Hopkins, Lieutenant Colonel Henry A. Edmundson, and Major Sylvester R. McConnell.

Other "MILLER"'s in the unit:

Miller, David
Co I Private Private

Miller, Jesse
Co F Private Private

Miller, Jesse A.
Co E Corporal Corporal

Miller, Joshua C.
Co A Private Private

Miller, William
Co I Sergeant Sergeant

Miller, William H.
Unknown A.Q.M. Capt. A.Q.M. Capt.

_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+

25th Virginia Cavalry Regiment Battle honors:
Monocacy - July 9, 1864
Chambersburg - July 30, 1864
Moorefield, West Virginia - August 7, 1864
3rd Winchester - September 19, 1864
Fisher's Hill - September 22, 1864
Cedar Creek - October 19, 1864

His compiled military records would tell you more about what he did.

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1860 United States Federal Census
about Daniel Miller
Name: Daniel Miller
Age in 1860: 51
Birth Year: abt 1809
Birthplace: Virginia
Home in 1860: Scott, Virginia
Gender: Male
Post Office: Estillville
Household Members: Name Age
Daniel Miller 51
Catharine Miller 44
Sarah Miller 14
John Miller 10
Jas M Sarget 28
Oliver Swan 31
Elizabeth Swan 19
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Oliver H. Swan
Regiment Name 48th Virginia Infantry.
Side Confederate
Company H
Soldier's Rank_In Private
Soldier's Rank_Out Private
Film Number M382 roll 54
48th Regiment, Virginia Infantry

48th Infantry Regiment, organized at Big Spring, near Abingdon, Virginia, in September, 1861, contained men from Scott, Washington, Smyth, Lee, and Russell counties. It fought in Jackson's Valley Campaign and later was assigned to General J.R. Jones' and W. Terry's Brigade, Army of Northern Virginia. The 48th participated in many conflicts from the Seven Days' Battles to Cold Harbor, then was involved in Early's Shenandoah Valley operations and the Appomattox Campaign. It was organized with 912 officers and men and had a force of 800 in May, 1862. The unit reported 17 casualties at Cross Keys and Port Republic, 62 at Cedar Mountain, 24 at Second Manassas, 7 at Fredericksburg, and 103 at Chancellorsville. Of the 265 engaged at Gettysburg more than twenty-five percent were disabled. Only 4 officers and 38 men surrendered. The field officers were Colonels John A. Campbell, Robert H. Dungan, and Thomas S. Garnett; Lieutenant Colonel Oscar White; and Majors James C. Campbell, Wilson Faris, and D. Boston Stewart
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The Daily Dispatch: April 4, 1863.
Murder of a minister.
--The Bristol Advocate learns that the Rev. Daniel Miller, a sutlers minister, and a most excellent citizen, was robbed and most brutally murdered at his residence, on Monday night last. It is not certain whether his residence is in the southeast portion of Scott or the southwestern portion of Washington county, Va.
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U.S. Civil War Soldiers, 1861-1865
about Oliver H. Swan
Name: Oliver H. Swan
Side: Confederate
Regiment State/Origin: Virginia
Regiment Name: 48 Virginia Infantry.
Regiment Name Expanded: 48th Regiment, Virginia Infantry
Company: H
Rank In: Private
Rank In Expanded: Private
Rank Out: Private
Rank Out Expanded: Private
Film Number: M382 roll 54

As I understand it, Daniel Miller was a sutler, a seller of goods, and a minister and as the latter, may have been exempt from some taxes.