I don't think ths is the second one you mentioned, but it seems relevant anyway:

SHERIDAN'S RIDE
by Thomas Buchanan Read

Up from the south at break of day,
Bringing to Winchester fresh dismay,
The affrighted air with a shudder bore,
Like a herald in haste, to the chieftain's door,
The terrible grumble, and rumble, and roar,
Telling the battle was on once more,
And Sheridan twenty miles away.

And wider still those billows of war
Thundered along the horizon's bar;
And louder yet into Winchester rolled
The roar of that red sea uncontrolled,
Making the blood of the listener cold,
As he thought of the stake in that fiery fray,
With Sheridan twenty miles away.

But there is a road from Winchester town,
A good, broad highway leading down;
And there, through the flush in the morning light,
A steed as black as the steeds of night
Was seen to pass, as with eagle flight;
As if he knew the terrible need,
He stretched away with his utmost speed;
Hills rose and fell; but his heart was gay,
With Sheridan fifteen miles away.

Still sprung from those swift hoofs, thundering south,
The dust, like smoke from the cannon's mouth;
Or the trail of a comet, sweeping faster and faster.
Foreboding to traitors the doom of disaster,
The heart of the steed and heart of the master
Were beating like prisoners assaulting their walls,
Impatient to be where the battlefield calls;
Every nerve of the charger was strained to full play,
With Sheridan only ten miles away.

Under his spurning feet the road
Like an arrowy Alpine river flowed,
And the landscape sped away behind
Like an ocean flying before the wind,
And the steed, like a barque fed with furnace ire,
Swept on, with his wild eye full of fire.
But lo! he is nearing his heart's desire;
He is snuffling the smoke of the roaring fray,
With Sheridan only five miles away.

The first that the general saw were the groups
Of stragglers, and then the retreating troops;
What was done? What to do? A glance told him both,
Then strikimg his spurs, with a terrible oath,
He dashed down the line 'mid a storm of huzzas,
And the wave of retreat checked its course there, because
The sight of the master compelled it to pause.
With foam and with dust the black charger was gray;
By the flash of his eye, and the red nostril's play,
He seemed to the whole great army to say,
"I have brought you Sheridan all the way
From Winchester down to save the day!"

Hurrah! Hurrah for Sheridan!
Hurrah! Hurrah for horse and man!
And when their statues are placed on high,
Under the dome of the Union sky,
The American soldier's Temple of Fame;
There with the glorious general's name,
Be it said, in letters both bold and bright,
"Here us the steed that saved the day
By carrying Sheridan into the fight,
From Winchester, twenty miles away!"

About the author: Thomas Buchanan Read

READ, Thomas Buchanan, poet, born in Chester county, Pennsylvania, 12 March, 1822; died in New York city, 11 May, 1872. His mother, a widow, apprenticed him to a tailor, but he ran away, learned in Philadelphia the trade of cigar-making, and in 1837 made his way to Cincinnati, where he found a home with the sculptor, Shobal V. Clevenger. He learned the trade of a sign-painter, and attended school at intervals. Not succeeding in Cincinnati, he went to Dayton, and obtained an engagement in the theatre.

Returning to Cincinnati in about a year, he was enabled by the liberality of Nicholas Longworth to open a studio as a portrait-painter. He did not remain long in Cincinnati, but wandered from town to town, painting signs when he could find no sitters, sometimes giving public entertainments, and reverting to cigar-making when other resources failed.

In 1841 he removed to New York city, and within a year to Boston. While there he made his first essays as a poet, publishing in the " Courier" several lyric poems in 1843-'4. He settled in Philadelphia in 1846, and visited Europe in 1850. In 1853 he went again to Europe, and devoted himself to the study and practice of art in Florence and Rome till 1858. He afterward spent much time in Philadelphia and Cincinnati, but in the last years of his life made Rome his principal residence.

While in the United States during the civil war he gave public readings for the benefit of tile soldiers, and recited his war-songs in the camps of the National army. He died while making a visit to the United States.

His paintings, most of which deal with allegorical and mythological subjects, are full of poetic and graceful fancies, but the technical treatment is careless and unskilful, betraying his lack of early training. The best known are "The Spirit of the Waterfall," "The Lost Pleiad," "The Star of Bethlehem," "Undine," "Longfellow's Children," "Cleopatra and her Barge," and "Sheridan's Ride." He painted portraits of Elizabeth Barrett Browning, the ex-queen of Naples, George M. Dallas, Henry W. Longfellow, and others. His group of Longfellow's daughters was popular in photographs. He turned his hand occasionally to sculpture, producing one work, a bust of Sheridan, that attracted much attention.

He possessed a much more thorough mastery of the memos of expression in the art of poetry than in painting. His poems are marked by a fervent spirit of patriotism and by artistic power and fidelity in the description of American scenery and rural life. His first volume of " Poems" (Philadelphia, 1847) was followed by "Lays and Ballads " (1848).

He next made a collection of extracts and specimens from the " Female Poets of America" (1848), containing also biographical notices and portraits drawn by himself. An edition of his lyrics, with illustrations by Kenny Meadows, appeared in London in 1852, and in 1853 a new and enlarged edition was published in Philadelphia. A prose romance entitled "The Pilgrims of the Great St. Bernard" was published as a serial. " The New Pastoral," his most ambitious poem, describes in blank verse the pioneer life of a family of emigrants (Philadelphia, 1854). The more dramatic and imaginative poem that followed, entitled "The House by the Sea" (1856), gained for it more readers than had been attracted by its own superior merits. Next appeared "Sylvia, or the Lost Shepherd, and other Poems" (1857), and " A Voyage to Iceland" (1857), and the same year a collection of his "Rural Poems" was issued in London. His "Complete Poetical Works" (Boston, 1860) contained the longer and shorter poems that had been already published. His next narrative poem was" The Wagoner of the Alleghanies," a tale of Revolutionary times (Philadelphia, 1862).

During the civil war he wrote many patriotic lyrics, including the stirring poem of " Sheridan's Ride," which was printed in a volume with "A Summer Story" and other pieces, chiefly of the war (Philadelphia, 1865). His last long poem was "The Good Samaritans" (Cincinnati, 1867). The fullest editions of his "Poetical Works" were printed in Philadelphia (3 vols., 1865 and 1867).