murder of about 3,000 Polish prisoners of war
... that during the German invasion of Poland in 1939, German war crimes included the murder of about 3,000 Polish prisoners of war?
... that during the <a href="./Invasion_of_Poland" id="mwAhA" rel="mw:WikiLink" title="Invasion of Poland">German invasion of Poland</a> in 1939, German war crimes included the <b id="mwAhE"><a href="./German_atrocities_committed_against_Polish_prisoners_of_war" id="mwAhI" rel="mw:WikiLink" title="German atrocities committed against Polish prisoners of war">murder of about 3,000 Polish prisoners of war</a></b>?