 "Havmanden" had a narrow escape in September 1914 when a British submarine mistook her for a German U-boat and launched an unsuccessful torpedo attack on her.Late in their careers, the class was identified as the A class and the pennant numbers of all the submarines were prefixed with an "A", becoming "A-2" to "A-7".None of the boats, however, ever displayed an "A" on their conning towers.