Gunningh Sloet was born 3 October 1783 in Kampen as the illegitimate daughter of Antje Broese, and worked as a domestic.
During a trip back from Paris to the Netherlands, she dressed as a man, which was common for female travelers to avoid harassment during journeys.
She served in combat during the sieges of Kampen, Coevorden, and Deventer during the War of the Sixth Coalition.
[1] In 1814, she was engaged to be married to Alida Landeel, and added the title "Lord of Amerongen" to her name.
She died as the widow of one Mr. Lettener on 16 August 1824 in Edam, North Holland.