During World War II, the 16th Army of Japan landed in West Java at the end of February, 1942. After subduing the population, around 30,000 American, Australian, British, Dutch, and Indo-European civilians were transported to civilian internment camps. In 1943, Weissenborn was interned in the Japanese prisoner of war camp Kareës in Bandung. Women and children were kept in the camp until 1945. The town of Garut was destroyed by fire and then in the aftermath of the Indonesian National Revolution, Weissenborn's studio was completely destroyed and all of her glass negatives were lost in 1947. That same year, she married Nico Wijnmalen and the couple moved to Bandung.