On the Western Front... The position of the Belgian army is becoming increasingly grave. It is clear that it is unable to stay in the fight for much longer. The British forces are beginning to fall back on Dunkirk and in the evening the order is issued to begin Operation Dynamo, the evacuation from Dunkirk. Admiral Ramsay, who commands the Royal Navy forces based at Dover, is appointed to command the operation. The scope of the operation is not made clear to the local French commanders at first and they feel, with some justice, that they are being abandoned.

In Norway... The British cruiser Curlew is sunk by air attack off Harstad. 

From London... General Dill becomes Chief of the British General Staff. His predecessor General Ironside takes over as Commander in Chief of Home Forces.