31 Mar 1939
- The fighting between Slovakia and Hungary largely ceased. ww2dbase [The Slovak-Hungarian War | CPC]
- British Prime Minister Neville Chamberlain noted that the United Kingdom and France would guarantee Polish borders, with military force if necessary. ww2dbase [The Danzig Crisis | CPC]
- Cruiser No. 72, under construction at Mitsubishi Yokohama shipyards in Japan, was officially named Katori. ww2dbase [Katori | Yokohama, Kanagawa | CPC]
- The first M.9A Master aircraft took flight. ww2dbase [M.9 Master | AC]
Timeline Section Founder: Thomas Houlihan
Contributors: Alan Chanter, C. Peter Chen, Thomas Houlihan, Hugh Martyr, David Stubblebine
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