 Her first success came on 11 May, northeast of the Virgin Islands, where she sank the unescorted British 4,963-ton cargo ship "Cape of Good Hope" with torpedoes and shell-fire.She mistakenly sank the unescorted and neutral 4,996 ton Brazilian merchant ship "Gonçalves Dias" with two torpedoes about 100 miles south of Ciudad Trujillo on 24 May.The ship was identified as Brazilian only after the attack when the survivors were questioned.