Poland and Germany suffered from a customs war
... that during a decade of the interbellum, Poland and Germany suffered from a customs war?
... that during a decade of the <a class="mw-redirect" href="./Interbellum" id="mwAjA" rel="mw:WikiLink" title="Interbellum">interbellum</a>, <b id="mwAjE"><a href="./German–Polish_customs_war" id="mwAjI" rel="mw:WikiLink" title="German–Polish customs war">Poland and Germany suffered from a customs war</a></b>?