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Bill Thayer

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 [decorative delimiter] Class of 1844

Vol. II

(Born D. C.)

Alfred Pleasonton​a

(Ap'd D. C.)


Military History. — Cadet at the Military Academy, Sep. 1, 1840, to July 1, 1844, when he was graduated and promoted in the Army to

Bvt. Second Lieut., 1st Dragoons, July 1, 1844.

Served: on frontier duty at Ft. Atkinson, Io., 1844‑45, — Lac-qui‑parle, Min., 1845, — and Ft. Atkinson, Io., 1845; in Military Occupation

(Second Lieut., 2d Dragoons, Nov. 3, 1845)

of Texas, 1846; in the War with Mexico, 1846, 1847‑48, being engaged in the Battle of Palo Alto, May 8, 1846, — and Resaca-de‑la‑Palma, May 9, 1846; on frontier duty at Santa Fé, N. M., 1848‑49, —

(Bvt. First Lieut, May 9, 1846, for Gallant and Meritorious Conduct
in the Battles of Palo Alto and Resaca-de‑la‑Palma, Tex.)

Albuquerque, N. M., 1849‑51, — Ft. Conrad, N. M., 1851‑52, — and

(First Lieut., 2d Dragoons, Sep. 30, 1849)

Scouting, 1852, being engaged against the Apache Indians in a Skirmish near the Laguna on the Jornada del Muerto, N. M., Jan. 25, 1852; on Recruiting service, 1852‑53; on frontier duty as Adjutant, 2d Dragoons, July 1, 1854, to Mar. 3, 1855, — Austin, Tex., 1854, — Ft. Chadbourne, Tex., 1854, — Ft. Leavenworth, Kan., 1855, — and on Sioux Expedition,

(Captain, 2d Dragoons, Mar. 3, 1855: 2d Cavalry, Aug. 3, 1861)

1855‑56, as Acting Asst. Adjutant-General, Nov. 7, 1855, to July 27, 1856; in Florida Hostilities, 1856‑57, as Acting Asst. Adjutant-General of the Department of Florida; in quelling Kansas Disturbances, 1857‑58, — as Acting Asst. Adjutant-General, May 31, 1857, to Sep. 13, 1858; and as Acting Asst. Adjutant-General of the Department of Oregon, Oct. 27, 1858, to July 5, 1860.

Served during the Rebellion of the Seceding States, 1861‑66: in organizing Volunteers, at Wilmington, Del., Apr., 1861; in the Department of Utah, June to Aug., 1861, in command of Regiment, which he marched to Washington, D. C., Sep.‑Oct., 1861; in the Defenses of Washington, D. C., Nov., 1861, to Mar., 1862; in the Virginia Peninsular

(Major, 2d Cavalry, Feb. 15, 1862)

Campaign (Army of the Potomac), Mar. to Aug., 1862, being engaged in the Siege of Yorktown, Apr. 5 to May 4, 1862, — in the Seven Days' Operations before Richmond, June 26 to July 2, 1862, — and in

(Brig.‑General, U. S. Volunteers, July 16, 1862)

covering the withdrawal of the Army of the Potomac to Yorktown, Aug. 18‑19, 1862; in the Maryland Campaign (Army of the Potomac), in command of advance Cavalry Division, being engaged in driving the enemy from Poolsville, Sep. 8, 1862, from Barnesville and Sugar-Loaf Mountain, Sep. 9‑11, 1862, from Frederick City, and through Cactochin Pass, Sep. 12, 1862, — Battle of South Mountain, Sep. 14, 1862, — Skirmish  p197 of Boonsborough, Sep. 15, 1862, — Battle of Antietam, Sep. 17, 1862,

(Bvt. Lieut.‑Col., Sep. 17, 1862,
for Gallant and Meritorious Services at the Battle of Antietam, Md.)

— Skirmish of Shepherdstown, Va., Sep. 19, and at Martinsburg, Va., Oct. 1, 1862, — Pursuit of Indicates a West Point graduate and gives his Class.Stuart's Cavalry, and Skirmish at the mouth of the Monocacy, Oct. 12, 1862, — in pursuit of, and constantly harassing, the enemy's cavalry to Warrenton, Va., Oct.‑Nov., 1862, — and in covering the rear of the Army on the march to Fredericksburg, Nov. 18, 1862; in the Rappahannock Campaign (Army of the Potomac), Dec., 1862, to June, 1863, being engaged in the Battle of Fredericksburg, Dec. 13, 1862, — and Battle of Chancellorsville, May 2‑3, 1863; in command of Cavalry Corps, Army of the Potomac, June 7, 1863, to Mar. 26, 1864; in the Pennsylvania Campaign, June‑July, 1863, being in command at the Combat of Beverly Ford, Va., June 9, 1863, — Skirmishes at Aldie, Middleburg, and Upperville, Va., June 17‑21, 1863, — Battle of Gettysburg, Pa.,

(Major-General, U. S. Volunteers, June 22, 1863)

July 1‑3, 1863, — and Pursuit of the enemy to Warrenton, Va., July,

(Bvt. Colonel, July 2, 1863,
for Gallant and Meritorious Conduct in the Battle of Gettysburg, Pa.)

1863; in Operations in Central Virginia, being engaged in the Capture of Culpeper C. H., Va., Sep., 1863, — and in command at the Action of Brandy Station, Va., Oct. 11, 1863; in the Department of the Missouri, Mar. 23, 1864, to Feb. 13, 1866, being engaged in the Defense

(Bvt. Brig.‑General, U. S. Army, Mar. 13, 1865, for Gallant and Meritorious Services
during the Campaign against the Insurgent Forces
under the Rebel General Price, in Missouri)

of Jefferson City, Mo., Oct. 8, 1864, — and in command of the Cavalry pursuing the Rebels under General Price towards Ft. Scott, Kan., and, after harassing him in several Skirmishes, finally routed him at the Battle of Marais des Cygnes, Oct. 25, 1864.

Bvt. Maj.‑General, U. S. Army, Mar. 13, 1865, for Gallant and Meritorious Services in the Field during the Rebellion.

Mustered out of Volunteer Service, Jan. 15, 1866.

Served: on leave of absence, Feb. 15, 1866, to Jan. 1, 1868.

Lieut.-Colonel, 20th Infantry, July 28, 1866: Declined.

Resigned, Jan. 1, 1868.

Civil History. — U. S. Collector of Internal Revenue, 1869‑70, and Commissioner, 1870‑71. President of the Terre Haute and Cincinnati Railroad, Sep. 21, 1871, to  

Military History. — Re-appointed, by Act of Congress,

Major, U. S. Army, Oct. 23, 1888, on the Retired List.

[Supplement, Vol. IV: 1890‑1900]

Vol. IV
Died, Feb. 17, 1897, at Washington, D. C.: Aged 73.

See Annual Association of Graduates U. S. M. A., 1897, for an obituary notice.​b

Thayer's Notes:

a He was the brother of Indicates a West Point graduate and gives his Class.Augustus Pleasonton, Class of 1826.

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b The AOG obituary adds very little; but see the (hostile) biographical sketch at the Latin Library, which does.

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