Global oil production continues with a new discovery in the Turner Valley oilfields in Alberta becoming significant with 1/6 of the oil in Canada coming from the new oilfield. The construction of the Portland–Montreal Pipeline from Portland, Maine to Montreal refineries brings oil to Eastern Canada where ocean-going oil tankers will then set off in escorted convoys dodging the formidable German U-boats to delivery the precious oil to the European battle front. Typical of the NFB's "Canada Carries On" series of documentary short films, "The Battle for Oil" was a morale-boosting propaganda film made in cooperation with the Director of Public Information, Herbert Lash. Using the format of a compilation documentary, the film, edited by Stuart Legg to provide a coherent story, relied heavily on newsreel material including "enemy" footage, in order to provide the background to the dialogue. A NFB film crew was also dispatched to the Turner Valley oilfields in Canada. The deep baritone voice of stage actor Lorne Greene was featured in the narration of "The Battle for Oil". Greene, known for his work on both radio broadcasts as a news announcer at "CBC" as well as narrating many of the "Canada Carries On" series. His sonorous recitation led to his nickname, "The Voice of Canada", and to some observers, the "voice-of-God". When reading grim battle statistics or narrating a particularly serious topic, he was known as "The Voice of Doom". As part of the "Canada Carries On" series, "The Battle for Oil" was produced in 35 mm for the theatrical market. Each film was shown over a six-month period as part of the shorts or newsreel segments in approximately 800 theatres across Canada. The NFB had an arrangement with Famous Players theatres to ensure that Canadians from coast-to-coast could see them, with further distribution by Columbia Pictures. After the six-month theatrical tour ended, individual films were made available on 16 mm to schools, libraries, churches and factories, extending the life of these films for another year or two. They were also made available to film libraries operated by university and provincial authorities. A total of 199 films were produced before the series was canceled in 1959. In a contemporary review of "The Battle for Oil", the "Educational Film Library Association" notes: "... the strategic value of oil in the present conflict is emphasized until it appears as the greatest asset any nation can possess in these days of long-range warfare."