Johanna van Warmelo was born on 18 November 1876, to Pastor Nicolaas Jacobus van Warmelo and his second wife Maria Magdalena Elizabeth Maré. Her father was a Dutch Reformed minister from the
Netherlands whilst her mother's family had been early emigrants to southern Africa. Brandt was educated for two years at the Good Hope Seminary for Young Ladies in
Cape Town. When her father died in 1892, Johanna and her mother set out for a six-month tour of Europe. At the start of the
Second Boer War in 1899, Johanna volunteered along with three of her brothers. She served as a nurse until the British captured
Pretoria, the capital of the
Transvaal. The Boers did not immediately surrender, however, and a long guerrilla war began. ,
Lord Roberts and the
Duke of Westminster. The Van Warmelos were largely left in peace by their "guests". This misplaced trust may have been due to Johanna's brother-in-law, Henry Cloete, who was married to her oldest sister. Cloete was a former British agent in South Africa and had been elevated as Companion of the
Order of St Michael and St George by
Queen Victoria. In their role of harmless civilians, Johanna and her mother were able to collect information on the movements of soldiers and ammunition, and they smuggled this information out using letters written in
invisible ink made from lemon juice. In 1902 Johanna married a minister, Louis Ernst Brandt. She had become so well known that messages of congratulations came from the leaders of countries. == World War I ==