Johnson enlisted in the
First Australian Imperial Force (AIF) on 10 February 1916. He was
court-martialled in
Egypt on 1 August 1916, charged with "striking his superior officer", found guilty, and sentenced to "six calendar months imprisonment with hard labor [sic]" his incarceration, which commenced on 16 August 1916, was suspended on 15 September 1916. Johnson then served with the AIF in
France from November 1916, was transferred to the
United Kingdom for treatment for "acute
nephritis" in February 1917, was repatriated to Australia in July 1917, and was discharged from the AIF on 18 October 1917 on medical grounds. == Personal life ==