This painting is called The Death of General Warren at the Battle of Bunker’s Hill, June 17, 1775, and is one of the most famous Revolutionary War paintings we have. It was painted by John Trumbull (he of the aide-de-camp of 19 days) who would become a famous painter and paint many other Revolutionary War scenes.
The scene is dramatic and breathtaking and almost 100% false, other than the fact that Major Pitcairn did die (he’s the British officer being held in is son’s arms) and that General Warren did die (he’s the one on the ground.
Propaganda in art has existed for a long time, though of course this wasn’t the earliest propaganda piece of the Revolution, not by a long shot. That might have to go to Paul Revere’s engraving of the Boston Massacre (which he totally plagiarized), or maybe even Benjamin Franklin’s “Unite or Die!” snake, though most people consider that the first political cartoon rather than propaganda (though there’s nothing that says they can’t be the same.
Joseph Warren was an incredibly influential person in the early Revolution and he’s almost forgotten now. He was a doctor in Boston who served on the Committee of Correspondence. He was the one who sent out dispatch riders (including Revere) on the night of April 18, 1775 to warn John Hancock and Samuel Adams that British Regulars were on the way to arrest them and seize the several tons of arms stored at Concord. He would narrowly miss death as he joined the fighting at Lexington and Concord, would be elected as President of the Continental Congress, and would be promoted as a Major General in the Massachusetts militia, but would join the fighting at Bunker Hill as a private soldier because he had no unit as of yet. He was one of the last men killed as the forces were leaving the redoubt built on top of the hill.