Here are some interesting tidbits from Peck's CSR's. [Italicized notes are my comments]

1/6/65 the undersigned recommend Col Peck to be Brig Gen to command the 2nd bgde of the 2nd infantry Div of the TM Dept-Henry Gray-Sparrow- [& other congressmen]

1/10/65 Senate Chamber-also recommending Peck to be Brig Gen to command the bgde recently commanded by Colonel Gray. Peck is from N La which is where most of the men of the bgde are from

Davis endorses favorably saying Peck is highly esteemed. If circumstances warrant, the proposed assignment would lead to much good.

1/17 Sec of War to AG for report

1/17/65 Gen Gordon warmly recommends Col Peck to be promoted for the vacancy he stated exists in the TM. If this is done, I must express the hope that authority will be granted to bring his command to this army & to my division

2/1/65 Hon C C Hesler and others recommend Hon H Gray to command forces Govt may place on the W Bank Ms River for the purpose of keeping open the communications.
----3/8 Cooper endorses to President-Henry Gray appears on our records as Col 28th La regt but has never been appt BGen by the Dept but appears to have commanded a Bgde, probably as Sr Col & is styled BGen n Gen Smith's return.
Gen Smith has recommended his appointment as BGen in communication rec'd a short time since, but as Col Gray has been elected to Congress, it was supposed he would not return to the army, & Col Peck has been apptd BGen for the Bgde lately under Col Gray. The Bgde was constituted as follows according to Gen Smith's return

2/11 Henry Gray to Gen Cooper-the bgde formerly under my command to which we desire Col Peck to be appointed is composed of the following reg’ts:
28th La
18th La
Crescent La-a consol reg’t of 13 Companies
When I left the Dept. these reg’ts would average one thousand each. They have suffered great losses in battle, but I spared no effort to recruit & succeeded. There is no Brigadier on that side who is from La. except Gen Hebert. Gen Nichols is there but he is unfit for duty in the field
The records of the AG’s office in Richmond do not [disclose] with any accuracy the true state of the army on the other side of the Ms River. I hope Col Peck will be appointed as it will be in accordance with the wishes of the bgde.

2/12/65 Henry Gray to Gen Breckenridge-I find there is some misapprehension of the facts regarding Col Peck’s promotion to command my old bgde in the TM- That bgde is composed of 3 reg’ts- the Crescent, the 18th & the 28th La- these reg’ts will average 1000 each. The Crescent is a consolidated reg’t. There is no brigadier on that side who can be appropriately assigned to command it.
The appointment of Col Peck was [desired] by the officers of the bgde, many of whom know Col Peck well
---2/18 Davis endorses-nomination recommended

2/19/65 Cooper to Sec of War-Gray’s bgde in the TM Dept is composed of the 11th, [probably confused w/ 11th Bn which is part of the consol Crescent aka 24th La Reg’t] 18th & 28th La reg’ts & 3 small Bns. Strength of bgde is not known nor is anything known of the requirements or necessities of the bgde for a Brigadier. I presume that the number of Brigadiers in the TM Dept is sufficient for the commands.
My records show that the 11th La was disbanded & nothing is known here of the reg’t of that number in the TM Dept. The colonels of the other 2 reg’ts are Armant-9/26/62, understood to have been killed, but not officially reported & Henry Gray rank 5/17/62-elected to congress

2/22 Peck apptd Gen to rank 2/18 to report to Gen K Smith TM Dept
Peck was apptd and confirmed Brig Gen on 2/22/65 to rank 2/18/65-but in the Army of N. Va. Gen Gordon credits him with leading the last charge at Appomattox, but that is unlikely since he was not in command of the bgde at Ft Steadman on 3/25, and did not surrender with his command. He rec’d his parole at Vicksburg 6/6/65.

3/8/65 Cooper’s reply to the President by War Dept that Gray is shown as Col of 28th La, & has never been apptd Gen by this Dept. He does appear to have commanded a bgde, probably as Sr Col & is styled as Brig Gen on Gen Smith’s return. I had recommended him for promotion earlier, but the matter was dropped when he was elected to Congress, not thinking he would return to the army. Meanwhile Col Peck has been promoted Gen to command that bgde lately under Col Gray. The bgde was constituted as follows according to Gen Smith’s return

Brigade
2 La Inf [??]-I believe this is meant to identify the bgde as the 2nd La Inf Bgde
28 La Inf
18 La Inf/Yellow Jacket Bn Consol
Crescent Reg’t/11 La Bn/CGR Bn Consol

There appears to be but 2 La inf bgdes on Gen Smith’s return; the one above mentioned, and the other commanded by Gen Thomas.
There is nothing in this office to show that a force is being organized in the TM Dept for the special service indicated & should one be organized for the purpose, I think one of the Brigadiers already in commission & serving in that Dept might very well be placed in command of this force without the necessity of a new appointment

6/9 Peck paroled at Vicksburg [perhaps was en route to W La to take over Gray’s old bgde & didn’t make it before war was over]