[1] In 1648 De Geer's charter on exporting Swedish copper ended.

Along with his son Laurens, and with a royal charter of Christina I of Sweden he founded the Swedish Africa Company, but moved its base from Gothenburg to Stade.

Caerloff was hired for three years as commander and director at a salary of one hundred guilders and an ounce of gold per month to cover the charges.

He then founded the Danish Africa Company and recaptured Carolusburg from the Swedes.

Because of the Dano-Swedish War he ordered to sell Carolusborg to the Dutch if the garrison entered into trouble.