Prolific mid twentieth century war and political cartoonist and designer. Armstrong contributed to a number of publications including the Argus, the Sydney Sun, Smith's Weekly, Melbourne Punch and Aussie. His first publication, at the age of 16, was in the Bulletin.
'Noel Counihan expressed his dislike of Armstrong's capitalist conformity in his cartoon The Strong Arm behind "Today's Armstrong", with "Big Business" using Armstrong's nose to draw anti-worker cartoons (ill. King, 136).'.