Moses desteny of Blücher

The German invasion fleet heading for Oslo was significantly delayed when Oscarsborg fortress opened fire with its two old 28 cm guns, followed by the 150 mm guns on Kopås on the eastern side of the Drøbak strait. The 28 cm guns inflicted heavy damage on the German cruiser Blücher, which was subsequently sunk by torpedoes fired from a land based torpedo battery. The Blücher sank with over 1,000 casualties among its crew and the soldiers it carried. The German invasion fleet - believing Blücher had struck a mine - retreated south and called for air strikes on the fortress. This delay allowed the King of Norway and the Royal family, as well as the government, to escape captivity.