The offensive was part of the armed conflict between Poland and the U.S.S.R. (February 1919–March 1921) in an attempt to expand their respective territories.
Editors. "U.S.S.R. offensive against Poland opens". The Literary Encyclopedia. First published 01 March 2010; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=12805, accessed 19 April 2015.]