5 Jun 1938
- Ernst Udet claimed the 100-kilometer closed-circuit landplane speed record flying the Heinkel He 100 V2 aircraft. ww2dbase [Ernst Udet | AC]
- Suggested by Chen Guofu, Nationalist Chinese troops began digging tunnels under dike at Huayuankou, Henan Province, China. ww2dbase [Henan Campaign | Chen Guofu | Huayuankou, Henan | CPC]

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