A contrary view was expressed by Derek Payton-Smith in the civil official history volume on oil: "Pluto contributed nothing to Allied supplies at a time that would have been most valuable—that is, when no regular oil ports were available on the Continent and the Allies were relying in the unsatisfactory Port-en-Bessin. Dumbo was more successful, but at a time when success was of less importance."[41] A similar sentiment was expressed by Major-General Sir Frederick Morgan, the head of the COSSAC staff, who considered that Bambi was not worthwhile, although he lauded Dumbo.[58]