From American Civil War Soldiers Record on Ancestry.com:
    Daniel H. Darling - CPT - Co C -7th Cavalry Regiment MI
    Residence: East Saginaw, Michigan; Enlisted,13Nov1862; Age 24 (birth date; 8June1836)
    Side served: Union; State served:  Michigan; Birth Date:  8 June 1836
    Promoted to Full Major, 22Mar1864 effective 01 July 1864. 
    Transferred on 1Jul1864 from company C to company S.
    Promoted to Full Lieutenenant Colonel, 26May1865. 
    Mustered out, 15Dec1865 in Jackson, MI

Will County Illinois USGenWeb Necrologist Reports (© 2002 The ILGenWeb Project All Rights Reserved):
Prof. Daniel H. Darling
Was born in Painesville, Ohio, June 8, 1836, and died at his home on Whitley avenue, in Joliet, June 24th, last (1909). He was a graduate of Lake Erie College and came to Will county in 1855. He was principal of the Lockport schools for three years, and then came to Joliet. He was a soldier in the Civil War and attained the rank of Colonel.

 Published Obituaries:

Joliet Evening Herald, Friday, June 25, 1909, Vol. 5 No. 183,  Front page

    Another member of the Grand Army, Professor D.H. Darling, for fourteen years superintendent of the Joliet public schools, but for the past then years retired, has answered the last roll call and has passed to the beyond.  He died at 2:30 o’clock this morning, at his home, 405 Whitley avenue.  Old age is assigned as the immediate cause of death.  For the past year he has been failing, and the end was not unexpected.  Mrs. Darling survives him.
    Prof. Darling has been a citizen of Joliet for the greater part of his days.  During the civil war he served as colonel in the Union army with Cap. Elwood.  At that close of the war he returned to Joliet, but he was ordered west, at that time of the Indian uprisings and it was not until the latter part of the 70’s that he returned to this neighborhood.
     Previous to serving as superintendent of schools, he held the superintendency of the Lockport schools.  He was 75 years of age at the time of his death.  Funeral arrangements will be announced later.

Joliet Sunday Herald, June 27, 1909, page 11

       The funeral of Professor D.H. Darling, who died Friday, will be held at the Christian church on Union street at 10:30 o’clock this morning.  Rev. P.D. Butler will officiate and deliver the sermon.  The remains will be taken to Kingsville, O., for interment.  Friends are requested to omit flowers.

Additional Biographical Material:

Genealogical and Biographical Record of Will County, Illinois, Biographical Pub. Co., Chicago, 1900 (pg485):

     COL. Daniel H. Darling has been a resident of this county since 1855, and at the outbreak of the Civil war was engaged in teaching in the Joliet schools.  The family of which he is a member has been represented in America since colonial days, and has borne its part in the various wars in which our country has engaged.  His grandfather was a soldier in the Revolution, and his father served in the second war with England, while he himself has a creditable record as an officer in the Civil war, in which he rose from the ranks to the command of a regiment.
     Professor Darling (for he is better known by this title than by that of colonel) was born in Painesville, Ohio June 8, 1836, and was fourth in a family of six children.  His father, Seth, was a native of Madison County, N.Y., and there learned the trades of carpenter, joiner and wheelwright.  He became a pioneer of the western reserve of Ohio, where he entered and improved a tract of land, and at the same time followed his trade.  There he remained until his death, in 1841.  His wife, Marline, was a daughter of Noah Anderson, who was born in Maryland, of Scotch parentage, and settled in Ohio at the same time with Mr. Paine, after whom the city of Painesville was named.
     After having completed the studies of the local schools, the subject of this sketch became a student in Lake Erie College, where he completed his education.  In 1855 he came to Illinois and accepted a position as principal in the Lockport school, where he remained for three years.  He then came to Joliet, as principal of the public schools of this city, in which capacity he was serving at the beginning of the Civil war.  Fired with the enthusiastic spirit and the patriotism of his forefathers, he determined at once to offer his services to the Union.  He went to Chicago for that purpose, but, as he weighed only one hundred and twenty pounds, the recruiting officers would not accept him.  However, he would not give up his purpose, but proceeded to Michigan, where he was accepted, becoming a member of Company C, Seventh Michigan Cavalry.  He was in all the campaigns and engagements of the army in the Potomac.  In the battle of Gettysburg he was wounded, but the need of soldiers being great and the battle a close one, he had the wound bound up, and continued in the fighting line, taking part in the fifteen battles that followed during the next fourteen days.  When the fighting ceased he permitted the physicians to dress his wounds in a hospital.  After the grand review in Washington he was honorably discharged, but immediately re-enlisted for service against the Indians, in which he made so creditable a record that he was promoted to the command of his regiment, serving under Generals Custer, Kilpatrick and Sheridan.  He now has in his possession, as an interesting relic, an Indian blanket worn by one of the savages, a memento of his first engagement with the Indians.
    The fatigue of long marches and exposure to inclement weather told severely upon Prof. Darling’s health, and on the expiration of his army service he was unable to immediately resume teaching in Will County.  As the Ohio Reform school was located in a very healthy place he went there, accepted a position in the school and continued in it for four years, when his health being again restored, he returned to Lockport and resumed work as principal of the schools.  When the need of a superintendent of schools was felt in Joliet he was offered the position, which he accepted, holding it for fourteen years.  In 1868 he married Miss Abbie Wyman, of Painesville, Ohio.  Owing to her ill-health, in 1896 he resigned his position, in order that he might be free to take her to a warmer climate during the winter months of each year.  He has long been recognized as one of the most efficient educators of northeastern Illinois.  Certainly there are very few who have accomplished more for the educational interests of Joliet than has he, and he richly deserves his high standing as a teacher.  In politics he has never been active, but is intelligently conversant with public affairs and votes the Republican ticket. During the war he was made a Mason, and took his first degree in General Washington’s old lodge at Winchester, VA.  He is connected with Bartleson Post, G.A.R.
     In religion he is identified with the Christian Church.