In Britain… During the night (April 27-28), 3 American LST landing craft, conducting an invasion exercise (Exercise “Tiger”), are torpedoed by German E-boats in Lyme Bay. A total of 638 troops are killed. This incident is kept secret for fear of damaging Anglo-American relations.

In New Guinea… US troops occupy the main airstrip at Hollandia.

Over Occupied Poland… Soviet aircraft conduct a nighttime raid on Lvov.