He resigned his commission in 1760 and accepted an appointment as field-marshal from Frederick V of Denmark, being charged in 1762 with the reorganization of the Danish army.
At the age of 5, the young Otto performed for King Frederick V of Denmark, and before he turned 12 his father had taught him to play violin, flute and piano.
The school's main building is in Louisenlund Castle, which was built by Hermann von Motz between 1772 and 1776 for Landgrave Charles of Hesse as a gift for his wife, Princess Louise of Denmark, the daughter of King Frederick V of Denmark.
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The buildings were put into order by 1721 when the great naval hero Niels Juel Vind was rewarded with Halsted Priory by Frederick V for his service to the crown.
Arbien helped Mandelburg secure financial support by contacting Pilo in Copenhagen, who then interested the Danish Legation secretary to the French Court in Paris Justitsråd Joachim Wasserschlebe, foreign minister Count Johan Hartvig Ernst Bernstorff and Adam Gottlob Moltke, and finally through them King Frederick V of Denmark.
In a dynastic marriage, Louise wed Prince Frederick of Denmark and Norway on 11 December 1743 at Altona, Holstein.