In 1686–1689, Königsmarck served in the army of Venice during the Morean War against the Ottoman Empire in Greece, where the two women accompanied him. Contemporary accounts describe how they spent their time in scientific investigations during their stay and at the ruins of Acropolis in Athens. She also describes how they conversed with learned Greeks about science and philosophy. After the Parthenon was hit by cannons in 1687, Anna found in the ruins an Arabic manuscript, which she donated to the Uppsala university when she returned to Sweden. She also wrote a description of her travels and her stay and discoveries in Greece. Her brother Samuel published her writings in the Swedish Official Gazette, making her the first Swedish war correspondent.