Editing 1940 (section)

===March===
{{Main|March 1940}}
*[[March 5]] – [[Katyn massacre]]: Members of the Soviet Politburo ([[Joseph Stalin]], [[Vyacheslav Molotov]], [[Lazar Kaganovich]], [[Mikhail Kalinin]], [[Kliment Voroshilov]] and [[Lavrentiy Beria]]) sign an order, prepared by Beria, for the execution of 25,700 Polish intelligentsia, including 14,700 Polish POWs.
*[[March 11]] – [[Ed Ricketts]], [[John Steinbeck]] and six others leave [[Monterey, California]], United States, for the [[Gulf of California]], on a marine invertebrate collecting expedition.
*[[March 12]] – [[Moscow Peace Treaty]]: The [[Soviet Union]] and Finland sign a peace treaty in Moscow, ending the [[Winter War]]; Finns, along with the world at large, are shocked by the harsh terms.
*[[March 13]] – Indian nationalist [[Udham Singh]] assassinates Sir [[Michael O'Dwyer]] (in revenge for the [[1919]] [[Jallianwala Bagh massacre]]) at [[Caxton Hall]] in [[London]], for which he is hanged on 31 July at [[HM Prison Pentonville]].
*[[March 18]] – WWII: [[Axis powers]] –  [[Adolf Hitler]] and [[Benito Mussolini]] meet at [[Brenner Pass]] in the [[Alps]]. After being informed by Hitler that the Germans are ready to attack in the west, Mussolini agrees to bring Italy into the war in due course.<ref>{{cite book |last=Burgwyn |first=H |title=Italian foreign policy in the interwar period, 1918-1940 |publisher=Praeger |location=Westport, Conn |year=1997 |isbn=9780275948771 |page=211}}</ref>
*[[March 21]] – [[Édouard Daladier]] resigns as Prime Minister of France; [[Paul Reynaud]] succeeds him.
*[[March 23]] – [[Pakistan Movement]]: The [[Lahore Resolution]], calling for greater autonomy for what will become [[Pakistan]] in [[British India]], is drawn up by the [[All-India Muslim League]] during a three-day general session at [[Iqbal Park]], [[Lahore]].
*[[March 30]] – WWII: Former [[Kuomintang]] member and Chinese foreign minister, [[Wang Jingwei]], announces the creation of the [[Reorganized National Government of the Republic of China]] in [[Nanjing]].
*[[March 31]] – WWII: [[Commerce raiding]] {{Ship|German auxiliary cruiser|Atlantis}} leaves the [[Wadden Sea]] for what will become the longest warship cruise of the war (622 days without in-port replenishment or repair).<ref>{{cite book |author=Muggenthaler, August Karl |title=German Raiders of WWII |publisher=Prentice-Hall |year=1977 |isbn=978-0-13-354027-7 |page=14}}</ref>