Within hours of the revolution, the American ambassador had authorised the withdrawal of US citizens on the island, and a US Navy destroyer, the USS "Manley", arrived on 13 January. The "Manley" docked at Zanzibar Town harbour, but the US had not sought the Revolutionary Council's permission for the evacuation, and the ship was met by a group of armed men. Permission was eventually granted on 15 January, but the British considered this confrontation to be the cause of much subsequent ill will against the Western powers in Zanzibar.