Looks like they first served in the Confederate army, later switching over to the Federals.

Edmond P. Chitwood
Residence was not listed;
Enlisted as a Corporal
"B" Co. AR 16th Infantry

Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records

..........

Edmond P. Chitwood, 4th Corporal, Company B, 16th Regiment Arkansas Infantry, enlisted March 20, 1862 at Frog Bayou by Col Hill for 1 year, appointed June 18, 1861, sent to hospital June 23, 1862, bounty due 50 Dolls., last recorded absent on the July/Aug, 1862 muster roll, no further records

.....

John Chitwood, age 33, Private, Capt. Turner's Co., Arkansas Infantry, joined for duty and enrolled October 26, 1861 at Shoal Creek, Ark. by Capt. Turner for 12 miles, traveled 100 miles to rendezvous, last recorded present on the July/Aug, 1862 muster roll, no further records

.....

Andrew Chitwood, age 19, Capt. Turner's Co., Arkansas Infantry, joined for duty and enrolled October 26, 1861 at Shoal Creek, Ark. by Capt. Turner for 12 miles, traveled 100 miles to rendezvous, appointed 3rd Sergeant June 18, 1862, last recorded present on the July/Aug, 1862 muster roll, no further records

.....

Arelus M. Chitwood, age 17, 2nd Corporal, Capt. Turner's Co., Arkansas Infantry, joined for duty and enrolled October 4, 1861 at Pekin, Ark. by Capt. Turner for 12 months, traveled 100 miles to rendezvous, reduced to ranks December 5, 1861, sent to hospital June 5, 1862, last recorded present on the July/Aug, 1862 muster roll, no further records

.....

Drury L. Chitwood, age 37, 1st Lieutenant, joined for duty and enrolled October 4, 1861 at Pekin, Ark. by Capt. Turner for 12 months, traveled 100 miles to rendezvous, recorded absent on the May/June, 1864 muster roll, tendered resignation March 27, 1862, Cabin Creek, Ark., left sick in Arkansas 28 March having 30 days leave of absence, no further records

* This company subsequently became Company B, 16th (Hill's) Regiment Arkansas Infantry

Note, there are no muster rolls for Company B subsequent to the June/July, 1862 muster at Saltillo, Miss. Hence, we cannot ascertain their subsequent service

M317: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Arkansas

.................................

Sixteenth Arkansas Infantry

The Sixteenth Arkansas regiment was organized in
November, 1861, near the present town of Rogers, Ben-
ton county. Its organization was as follows: Col. John
F. Hill, of Johnson county; Lieut.-Col. William T. Neal,
of Washington; Major Farmer, of Johnson county; Adjt.
Ben Pixlee, Quartermaster A. M. Ward. Company A,
Capt. L. N. C. Swaggerty, of Johnson county; Company
B, Captain Turner, of Johnson county; Company C,
Capt. John Connolly, of Johnson county; Company D,
Capt. W. W. Bailey, of Carroll county; Company E,
Captain Garrett, of Carroll county; Company F, Captain
Goodnight, of Stone county; Company G, Captain Car-
nahan, of Washington county; Company H, Captain Kelly,
of Pike county; Company I, Capt. Daniel Boone, of Mad-
ison county; Company K, Capt. John Lawrence, of Searcy
county.
The regiment went into camp at Elm Springs, Benton
county, where it remained in winter quarters until Feb-
ruary, 1862, when General Price and his army of Missouri
fell back before a large force of Federals under General
Curtis, and made a stand at Elkhorn tavern in Benton
county. On the 4th of March, the regiment marched to
reinforce Price, forming part of Hebert's brigade, under
command of Gen. Ben McCulloch, and took part in the
battle of the 7th. The regiment entered into action soon
after General McCulloch's death, passing the body of the
dead general in their charge. The greater part of the
Confederate forces which retreated to Frog Bayou, con-
sisting of Missouri and Arkansas regiments, were trans-
ferred under Generals Price and Van Dorn across the
Mississippi river in April, 1862. The Sixteenth was
brigaded with four Missouri regiments, formerly com-
manded by Col. Francis Cockrell, which were the flower
of Missouri, and at Corinth were again united in a bri-
gade commanded by Gen. Henry Little, afterward killed
at Iuka. While at Corinth the Sixteenth was reorganized
and the following officers chosen: Col. David Provence,
formerly captain of battery of artillery known by his
name ; Lieut. -Col. B. T. Pixlee, Maj. J. M. Pitman, Adjt.
John S. Tutt, Quartermaster Arch McKennon, Commis-
sary Sam Hays, Sergt. -Maj. David Bronaugh. Captain
McKennon is now a member of the Dawes Indian com-
mission. The company commanders at reorganization
were : Company A, Capt. L. N. C. Swaggerty; Company
B, Capt. Jesse L. Cravens; Company C, Capt. James
Gearwood; Company D, Capt. E. G. Mitchell; Company
E, Lieut. J. H. Berry, commanding; Company F, Capt.
William B. Stevens; Company G, Capt. J. P. Carnahan;
Company H, Capt. G. D. R. Preston, then J. B. Cloud;
Company I, Capt. Daniel Boone ; Company K, Capt.
James Waldron. The regiment participated in the move-
ments around Corinth on the approach of the Federal
army under Halleck. In September, 186.2, it took part in
the battle of Iuka, and in October, 1862, it participated
in the desperate assault on the Federal encampment at
Corinth, where it lost heavily. Lieut. J. H. Berry, who
lost a leg in this battle, was afterward prosecuting attor-
ney, judge, governor, and United States senator from Ar-
kansas. Shortly after, the regiment was detached from
the Missouri brigade and assigned to the Arkansas bri-
gade, commanded by Col. Jordan E. Cravens, Arkansas
troops, at Holly Springs, Miss. It was there again de-
tached and sent with other Arkansas regiments to Port
Hudson, La., and with the Eleventh, Colonel Logan; the
Twelfth, Colonel Reid; the Fourteenth, Lieut.-Col. Pleas-
ant Fowler; the Fifteenth, Col. Ben Johnson; the Seven-
teenth, Col. John Griffith; the Eighteenth, Col. R. H.
Crockett; and the Twenty-third, Col. 0. P. Lyles, under
Gen. William N. R, Beall, went through the siege of
forty-eight days, and was surrendered to General Banks
July 9, 1863. Lieutenant-Colonel Pixlee was killed dur-
ing the siege, and Maj. J. M. Pitman succeeded him;
Captain Swaggerty, of Company A, becoming major,
and Lieut. Jesse Adams, captain of Company A. The
officers were sent as prisoners to Johnson's island, except
Capt. Daniel Boone, Lieut. J. G. Crump and William
McConnell, who swam ashore from the transport convey-
ing them and made their escape. Capt. Jim Cravens and
Lieuts. Paynor, W. W. Bailly and Wilson escaped through
the lines and returned to their homes in Arkansas, where
they re-entered the service in other commands.

Source: Confederate Military History, vol. XIV, p. 314