“ The loss of the Danes, half of whose forces were not engaged, included 1800 killed and wounded and 3400 prisoners. This operation was followed by the daring passage of the Alsen Sund, effected by the Prussians in boats almost under the guns of the Danish war-ships, and resulting in the capture of the whole island of Alsen (June 29th, 1864) . After being still further strengthened and linked with similar defences at Sonderburg, the Düppel entrenchments were abandoned in 1881 in favour of landward fortifications around Kiel. ”

“ See R. Neumann, Über den Angriff der Düppeler Schanzen in der Zeit vom 15. März bis 18. April 1864 (Berlin, 1865) ; and Der deutsch-dänische Krieg 1864, published by the Prussian General Staff (Berlin, 1887) . ”