After scuttling "Uller", "Tyr" abandoned her mining mission and retreated southwards to Bergen, carrying the crew of "Uller" with her. Norwegian scouts were however still following her. Before the minelayer got back to base she was ambushed in the Fålefotsundet narrows between Hisøya and the mainland by the crew of a Norwegian guard boat that had been stalking her since leaving the Sognefjord. The crew had taken up positions on both sides of the narrows and opened a harrowing fire on the minelayer as she passed through. As "Tyr" was shot up with intense machine gun fire the German crew replied with her 12 cm main gun and automatic weapons without hitting any in the ambush force. The fire fight continued until "Tyr" had passed through the narrows and got out of range of the Norwegians' light weaponry, making it back to Bergen. "Tyr" saw no further service during the Norwegian Campaign.