In 1649–50 Yerofey Khabarov became the second Russian to explore the Amur River. Through the Olyokma, Tungur and Shilka Rivers he reached the Amur (Dauria), returned to Yakutsk and then went back to the Amur with a larger force in 1650–53. This time he was met with armed resistance. He built winter quarters at Albazin, then sailed down the Amur and found Achansk, which preceded the present-day Khabarovsk, defeating or evading large armies of Daurian Manchu Chinese and Koreans on his way. He charted the Amur in his "Draft of the Amur river".