The 89 meter long, 3792 dwt freighter Ostgard became disabled after engine failure near the Belle Isle, Bay of Biscay.   The crew attempted repairs, but was unable to restart the engine.   A salvage tug was dispatched to tow the Ostgard to Saint-Nazaire.   No reports of injuries, damage or pollution released.  The Ostgard was en route to Rochefort, France from Sweden with a cargo of lumber.