What advice/declaration by Governor-General Canning led to the creation of this famous cartoon published in the pages of Punch, a British journal of comic satire?

He declared that a gesture of leniency and a show of mercy would help in winning back the loyalty of the sepoys,

Governor General Canning declared that a gesture of leniency and a show of mercy would help in winning back the loyalty of the sepoys. Though, he was mocked in the British press. In one of the cartoons published in the pages of Punch, a British journal of comic satire, Canning is shown as a looming father figure, with his protective hand over the head of a sepoy who still holds an unsheathed sword in one hand and a dagger in the other, both dripping with blood.