Onufriy Stepanov

Onufriy Stepanov (Russian: Онуфрий Степанов) (died June 30, 1658) was a Siberian Cossack and explorer of the Amur River. For background see Russian–Manchu border conflicts.

1653: After Yerofey Khabarov’s arrest and departure to Moscow in the fall of 1653, Onufriy Stepanov was appointed his deputy in the region of Dauria (upper reaches of the Amur River) and put in charge of the 320 men who remained there. Stepanov and his men suffered privations without enough grain and timber, so they decided to sail down the Amur River beyond the Sungari River to the Ducher country in order to procure food and building materials. Stepanov succeeded in his mission, but not without skirmishes with the Duchers, exacting a considerable yasak from them. Here he built winter quarters.

1654: In the summer of 1654, Stepanov sailed back to the Sungari River to find grain and was joined by another band of 50 cossacks. After sailing up the Sungari for three days he met a Manchu army under the command of Mingandali. (according to Stepanov, it consisted of 3,000 Chinese and Manchus, not including the Duchers and Daurs). A river battle ensued, and Stepanov and his men came off victorious, but the remaining Manchu forces went ashore and entrenched themselves. The Cossacks made an attempt to besiege the trenches, but sustained losses and had to retreat downriver where they were joined by 30 men under sotnik Beketov. He retreated up the Amur, past the Zeya to the mouth of the Kamora River, and wintered at the half-ruined Kamora fortress (Каморский острог).

...
Wikipedia