Just anchor the ships within range of his docks and let them attack any incoming enemy ships. The quest does go on for a bit and you will be notified after the last wave that the quest is complete.
Thx for de reply......i have had my ships stationed there atleast for 2 to 3 hours....there s no sign of any enemy ship ..... can you tell me how long exactly does t tke for de quest to be completed..if you have a savegame after tis quest or chapter can you post t???