Avigdor Levy identified a number of instances where, from the late 1700s various newly arrived 'Cossack' refugees arrived within the Ottoman Empire, to resettle and were employed in various military auxiliary roles [1].

• This even encluded service on Imperial Navy Ships as LEVENTI or 'Turckischer ship-soldiers'. As 700, in 1817, were recuited to serve in the reformed Ottoman Danube Flotilla (a river fleet of gun boats).
• In 1824, 60 of the 'Cossack' LEVENTI were seen on the Ottoman Battleship 'SELIMIYE' (1,400 member crew) wearing their Cossack -styled "sheep-skin caps".

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[1] Levy, Avigdor. "Formalization of Cossack Service Under Ottoman Rule." East Central European Society and War. Ed. Gunther E. Rothenberg et al. New York: Columbia University Press, 1982: 491-505.

In 1826, the 'Silistra Cavalry Regiment' was formed, as part of the general reorganization of that year, and was raised in Silistria province (the Danube Delta), and made up of Turks, Tatars and Christians in equal proportions.

• The latter were a mixture of old believers and Zaporozhain Cossacks who had fled Russian rule and been allowed to settle in the region.

The Regiment-Brigade was organised into two ‘alays’ (regiments):

• One of these, later became a regular cavalry Dragoon regiment.
• The remaining Cossack regiment, may be the origin of the 1848 1st Cossack regiment (discussed below). Avigdor Levy, does not identify that the 'Cossack' battalion in the original 'Silistra Cavalry Regiment' were armed with lances; however, as this was the traditional weapon of the Cossacks, it would seem likely, and that the Turkish battalion in the original 'Silistra Cavalry Regiment' were operated more as Dragoons, armed with swords and muskets only.

In terms of the uniform of the 1826 regiment, the men were issued with:

• Vests: This could be referring to the sleeveless over-coat-vest, which was fitted with hanging sleeves/wings that are commonly seen in Ottoman uniforms throughout this period, as well as like the 'Cossacks' costume that incorporated the very same detail.
• Short jacket: However, reading Avigdor Levy’s description he is actually describing the standard jersey, being issued to all New Model Army soldiers. 
• Oriental breeches.
• Black riding boots.

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[1] Marcel Roubicek (1978) Modern Ottoman Troops, 1797-1915: In Contemporary Pictures. Franciscan Printing Press: 13.

[2] Egyptian Circassians (formed as a cavalry auxiliary unit in the Egypt Army in the 1840s). Nevertheless, would still be representative of the type of uniforms worn by the 1848-1853 1st Regiment.

The 1854 banner of the Ottoman Cossacks regiment, was received in Edirne when the Cossacks officially took an oath to join the Sultan’s service, This was the old banner of Zaporozhian Cossacks (which had been kept in Constantinople, following the Ottoman-Russian war in 1828-29).

• The banner, is originally described as silk, with a cross on a blue background.
• There is also an account that says the "Ottoman Cossack Brigade flag of the brigade was two-sided, on the front there was the crescent and on the back a cross."
• This could be referring to the flag halved: first half, red with silver crescent (an Ottoman flag); with a second half in blue, with gold cross (that is a second flag - the old banner of Zaporozhian Cossacks, being added on the end).
• It is more likely, this is describing the old banner of Zaporozhian Cossacks, which has been incorporated into the reverse side of the standard Ottoman Imperial Army flag.
• A version of this banner is illustrated in modern books, as a white background for the cross, and this is shown with the flag halved: first half, red with silver crescent; second half white, with gold cross. However, this is not likely correct [1].

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[1] Finally, there is a 2009 Wikimedia Commons version of the "Banner of the Polish Sultan Cossacks Division during Crimean War", which is red, and shows a crescent and polish eagle, but this has no historical verification.