as a result, olgerd was forced to lift the siege. it lasted 4 days and detained the lithuanians. prince dmitry ivanovich later it will be called the don organize the defense of moscow, not taken, volokolamsk rear fettered the movements of the olger, yes, and when it became known that princes vladimir serpukhov and oleg ryazan were already going to send troops to the aid of prince moscow, the olgel was forced to completely retreat from the moscow principality. on november 29, 1870, the first expedition of nikolai przhevalsky to central asia began, accompanied by another russian traveler. mikhail polltsov, in 3 years the researchers covered almost 12,000 km from the city kyakhta in buryatia through beijing to hard-to-reach areas of china, tibet and mongolia proved that the yellow yellow river has no branching. as it was thought, before przhevalsky wrote a book following the results, mongolia and the tangut country, in total, he made four trips to areas of central asia previously unknown to europeans, discovered many geographical objects, including seven large lakes , several new sp