Neman

4 clues
Russian river
River in Russia
East European river
River in Belarus crossed by Napoleon in 1812
Similar answers:
Aaamilne
Aaline
Aamilne
Aaroneckhart
Aasifmandvi
Abagofnerves
Abalone
Abalones
Abalonesandwich
Abalonetexas
Abandoned
Abandonedsheep
Abandonedship
Abandonedshipit
Abandonedwell
Abandonee
Abandonees
Abandononespost
Abaserunner
Abbelane