John Singer Sargent's Gassed is one of IWM's most iconic and best-loved objects. Truly monumental in scale, it is also the largest painting in the museum's collection and has been on near-constant display since it was first exhibited in 1919. A favourite among visitors and the most requested image by researchers and publishers, the work endures as a lasting symbol of modern art in public service, and of the transformative conflict from which it came. In the following pages IWM's Head of Art Rebecca Newell traces the origins of this large and powerful painting in the final months of the First World War and celebrates the vibrancy and visual power of the work, revealed once again during recent conservation. John Singer Sargent's Gassed reflects on the challenges of creating and displaying a canvas of such size and the dramatic impact the work has had on generations of visitors to IWM. Finally, the book considers the painting's enduring legacy in the context of art inspired by conflict - a legacy now secured for future generations.