Around 1915 he accepted a position on the literary staff of
The Argus, and worked as a Federal roundsman. He publicly supported the pro-conscription stance of Prime Minister
Billy Hughes and was chosen by Hughes to manage the "pro" campaign for the
second conscription referendum. He returned to the
Argus after the war. Around 1922 the
Melbourne Sun and
Sun News-Pictorial had been founded by the publishers of the Sydney
Sunto break into the Melbourne market. The daily newspaper failed, with a loss of between £120,000 and £150,000 in the first few years, but the
Sun News-Pictorial was quite successful, and was purchased by the
Herald & Weekly Times in 1925. Dumas was hired to oversee the transition and has been credited with the paper's subsequent success. In 1927 he was sent to London to manage the
Australian Newspapers Cable Service. ==Return to South Australia==