So, this is the puzzle:
{decaf} {regular} {regular} {regular} {regular}
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Tsushima | Kursk | Leningrad | Berezina | Khalkin-Gol
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http://dspace.dial.pipex.com/town/avenue/vy75/ (http://dspace.dial.pipex.com/town/avenue/vy75/)
http://www.geocities.com/SouthBeach/Marina/8163/Tsushima.htm (http://www.geocities.com/SouthBeach/Marina/8163/Tsushima.htm)
http://en.wikipedia.org/wiki/Siege_of_Leningrad (http://en.wikipedia.org/wiki/Siege_of_Leningrad)
http://www.ddg.com/LIS/InfoDesignF96/KScott/Berezina.html (http://www.ddg.com/LIS/InfoDesignF96/KScott/Berezina.html)
http://orbat.com/site/history/historical/r...in-gol1939.html (http://orbat.com/site/history/historical/russia/khalkin-gol1939.html)
They're all locations of battles, generally involving Japan or Russia, however the only odd one out I can see is that Berezina is a river while the others are towns/cities.