From Hessians: Mercenaries, Rebels, and the War for British North America, by Brady J. Crytzer (Westholme, 2015), Kindle Loc. 1464-1476:
As was often the case, Ewald was aware that Patriot politicians had labeled his Hessian comrades as “mercenaries,” or soldiers of fortune. For this reason many Americans despised the German auxiliaries that fought alongside him. It was no secret that the Hessians had no real practical issue with the American rebels, and Ewald was only serving the British king under the wishes of his own Landgraf Frederick II. A mercenary, in contrast, fought for his own material gain and epitomized opportunistic soldiering in this period. Yet Diwizow was quite different as he was not German, Irish, or British. He asserted that he was a Cossack from the Don River valley in southern Russia. Ewald’s interest was piqued at this development. Diwizow explained that he was already well into his fifties, and the thought of retirement was simply not tenable. He had battled in one way or another for his entire life and as war was his primary income he was looking for a fight. At Ewald’s inquiry, the Cossack explained how his travels brought him to America. He had spent twenty-four years as an officer with the Don Cossacks, and had battled the Prussians in the Seven Years’ War. Ewald first saw action in that same conflict and his curiosity grew. Diwizow continued by claiming that his mercenary travels took him far and wide, from the jagged lands of Ottoman Turkey to the rich valleys of Poland. He fought for no flag and no country, merely for raw economic gain. Twenty years earlier Diwizow battled against the Polish, and as recently as 1774 alongside Yemelyan Pugachev, the royal pretender who led a massive revolt in Russia against Catherine the Great. If there was ever a mercenary in North America, it was this hardened Cossack.