 At Cartagena, Drake released one hundred Turks held as slaves.On 6 June 1586, during the return leg of the voyage, he raided the Spanish fort of San Agustín in Spanish Florida.After the raids he then went on to find Sir Walter Raleigh's settlement much further north at Roanoke which he replenished and also took back with him all of the original colonists before Sir Richard Greynvile arrived with supplies and more colonists.