By mistake Pol III rams Albatros. Then Pol III ges up side by side with Albatros and there is a short conversation between the commanders. The commander is wounded, and drowns when the the crew leaves the boat. The first Norwegian causalty of the invasion. Rau y is battle ready.
Searchlights are lit.
This is the first indication of Nationality that the Norwegian command gets. The main battery of Oscarsborg opens fire on Bl cher at a distancce of 1800 m, scoring two hits. The return fire is unable to make any damage. R17 and R27 enters the bay containing Horten harbour. Albatros and Kondor stays outside, north of the inlet.