armoured trains of Poland
... that armoured trains of Poland proved to be surprisingly successful during the Polish Defensive War of 1939?
... that <b id="mwDpM"><a href="./Armoured_trains_of_Poland" id="mwDpQ" rel="mw:WikiLink" title="Armoured trains of Poland">armoured trains of Poland</a></b> proved to be surprisingly successful during the <a href="./Invasion_of_Poland" id="mwDpU" rel="mw:WikiLink" title="Invasion of Poland">Polish Defensive War</a> of 1939?