Did you perchance mean mossback?
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Examples
“It had also considerable problems with the cossacks and the tartars.”
“A Game of Shadows provides Ritchie with a licence to run wild with Gypsies, trade punches with cossacks, or just generally arse about in expensive hotels.”
“By that theory the Czar's cossacks "incentived" Russian jews to be more creative every time the cossacks burned the jewish homes in a pogrom.”
Lessig on Copyright, Arnold Kling | EconLog | Library of Economics and Liberty
“Category: paul krugman, pejman yousefzadeh, the cossacks work for the Czar”
“Lands imperial armies had conquered, cossacks homesteaded, Bolshevik engineers industrialized, Red Army troops defended—all signed away, with a few strokes of a borrowed pen.”
“And sure enough, two hefty cossacks pulled out an enormous chest with several heads, which nightmarishly ‘observed’ those present with their glassy eyes.”
“Say what you like about Paulson, but he's merely a cossack, and as you know, the cossacks work for the czar (and his name is Dick Cheney).”
“Well, all I can say is, God bless Peggy Parsons: Star-belly Sneeches and modern day cossacks”
“Please welcome this tale of snowy mountains, quick-witted cossacks, and Russian monsters to Rage of the Behemoth.”
“It appeals to a species of tyrant who prefers candy to cannon and cossacks to get what he wants.”
Lists
These user-created lists contain the word ‘cossacks’.
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bad guys
black hat, thug, thugz, highwayman, brigand, pirate, corsair, raider, viking, visigoth, vandal, gangster and 46 more...
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Historical Military Terms of Interest
Many (if not all) of these terms were selected from A pocket dictionary, for military officers, containing a definition of all the tactical terms now in use, with other matter belonging to the art ...
zig-zags, yeoman, xerxes, xeiff, xenophon, worm, watch-word, windage, wheeling, wad-hock, wadding, volley and 242 more...
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chained_bear "a wild irregular people in military history who inhabit the Ukraine. They are now a regular militia." (citation in list description)
In the same book, under cavalry, is slightly more information (or "information"):
"Cossacks, are a half civilized people of Russia, forming several nations, having nearly the same habits and manners; their features are broad and flat, with a pair of small, fiery and piercing eyes, rather of a small stature, very robust, active and courageous; they manage their arms with astonishing dexterity, and are very skilful in taming wild horses: they form an irregular cavalry in the Russian service. The arms of the Cossack are a brace of pistols, a sabre, a musket and a lance 10 or 12 feet long, which is fastened to the wrist, and also to the right foot, by the action of which, it is thrust forward with great force and proves fatal to the foe. Their horses are said to be quite diminutive, but are mettlesome, can walk 5 miles an hour, and are remarkably swift. A Cossack is raised with his horse and becomes so well skilled in riding, that they will leap their horses from the steepest banks into a deep and rapid river, will traverse dry and burning sands, or cross a forest almost impervious and covered with snow. Nothing can elude their activity, escape their penetration or surprise their vigilance. Irreparable disgrace would attend the Cossack, whose negligence offered an advantage to the enemy—cowardice itself could not attach so fatal a stigma; and no instance of surprise is on record: These are the troops which could strike terror into the French legions." Oct 9, 2008