A lụrụ agha nke Warsaw site na Ọgọstụ 12 ruo 25, 1920 ka ndị agha Red Army nke Mikhail Tukhachevsky nyere iwu na-abịaru nso isi obodo Poland nke Warsaw na Modlin Fortress dị nso. Na August 16, ndị agha Polish nke Józef Piłsudski nyere iwu si na ndịda, na-akpaghasị mwakpo onye iro, na-amanye ndị agha Russia ịhapụ ọwụwa anyanwụ na n'azụ Osimiri Neman.
Osimiri Neman