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'Then Farewell My Trim-Built Wherry', 21 November 1915, depicts Winston Churchill as a bargeman who has been forced to reisgn following disaster of the Dardanelles campaign.
The wartime cartoons of one of Britain's most popular 20th century cartoonists', which inspired millions of people, have emerged.
Joseph Morewood Staniforth produced more than 1,300 cartoons during the First World War for the News of the World and the Western Mail in Wales.
His most memorable cartoons included a rousing call to arms following Lord Kitchener's plea for recruits, Winston Churchill dressed as a bargeman after the failed Dardenelles campaign and Kaiser Wilhelm II of Germany depicted as a beggar.
In another cartoon he paid homage to William Shakespeare and he even created his own Welsh war hero, Dai Pepper, who captured a German dugout wearing a coal miner's 'curling box' instead of a helmet.
Following his death in 1921, he was described by Prime Minister Lloyd George as 'one of the most distinguished cartoonists of his generation' whose patriotic cartoons had 'rendered a great national service'.