From "Ranger Mosby" by Virgil Carrington Jones, Chapel Hill, University of North Carolina Press 1944.
pp. 200-201
"On Mosby's trail at this date appeared a man who from all appearances was the answer to Union prayers concerning the raiders. He was Richard Blazer, hardened Indian fighter who looked on the Confederate independants as fighters of a class with the red men he had chased on the plains. He appeared at Sheridan's headquarters while the furore still raged over the wagon train attack at Berryville and was given an attentive ear. With 100 men, each armed with Spencer repeating rifles, he would clear the country of Rangers, he promised. Sheridan immediately wired military authorities at the capital: "I have 100 men who will take the contract to clean out Mosby's gang. I want 100 Spencer rifles for them. Send them to me if they can be found in Washington."
This was around mid-August, 1864. First report of Blazer's men clashing with Mosby while using those Spencers was at Kabletown on September 4th.
And just two months later. . .
Ibid, pp. 230
"Worded nearly three months later to the day (Three months after Blazer's unit had been formed. This message of Stevenson's referred to dated November 19th, 1864), Stevenson's message stated: "Two of Captain Blazer's men came in this morning, Privates Harris and Johnson. They report that Mosby, with 300 men, attacked Blazer near Kabletown yesterday about 11 o'clock. They say that the entire command, with the exception of themselves, was either captured or killed."
With a few variations, that was the story. Blazer, during his entire career as an independant scout on the trail of Mosby and his band, had never been a serious threat."
This is just a quick response. I will add your research request to Major Matt's when I scan The Official Records tonight. Late in the war like that, I would imagine they had standard issue uniforms, and most probably, very generic. My guess would be that they were in existence too short a time to have any distinctive unit insignia, nor would have encouraged it in the counter-guerilla fighting they were involved with. If they wore civilian attire or donned Confederate items, then common sense and general research would do as well as any other's research.
Others will chime in here, Dai, I'm sure, but give me a little time to swim through the "OR". . . .I feel a two-pots-of-coffee evening of fun coming on.
RCJ