Joe Sacco’s latest work, “The Great War,” a twenty-four-foot-long panorama that folds like an accordion, illustrates the first day of the Battle of the Somme, one of the bloodiest battles in history, which took place on July 1, 1916. The Maltese-American cartoonist is best known for his comics journalism, including works like “Palestine,” “Safe Area Goražde,” and “Days of Destruction, Days of Revolt” (his 2012 New York Times best-selling collaboration with Chris Hedges), but “The Great War” is a purely visual work, homing in on a specific moment in history. We spoke with Sacco about his approach.

When I got a call from an old friend of mine, an editor at Norton, asking me to draw a panorama of the Western front, my first response was “No!” Being a cartoonist, I always think in terms of narrative—but I grew up on Australia, and there the First World War truly gives Australians a sense of national identity. I’ve been reading about it since I was a kid, and I’ve spent so much time thinking about it—I’ve read so many books—that in the end, I thought, Why not?

When you read obsessively about a subject, at some point you begin to wonder about yourself. Why am I reading another book about the First World War? What’s pulling me in? So one of the reasons I agreed to do this panorama was trying to deal with my historical voyeurism: O.K., I should deal with this now, because otherwise, why did I visit the Somme battlefield fifteen years ago? It was almost like a penance for a boyhood interest that had lasted so long.

I don’t feel a separation from the people I read about in history books. Right now, I’m working on a long book on Mesopotamia—that’s years in the making, it’ll take a long time. I’ve been obsessed with the Middle Ages, I’ve been obsessed with the ancient world, I read a lot about different subjects—and to me, they’re all living people, just people who are just no longer with us.

When we first talked about my drawing a panorama of the Western front, the idea seemed static. But immediately I thought of the Bayeux Tapestry [a work probably made in the eleventh century depicting the Norman Conquest], which has a narrative. William the Conqueror in France is getting ready for the invasion; they’re building the boats; they’re crossing the English Channel; then there’s the Battle of Hastings, and you basically read it left to right. It just came to my mind that I could show soldiers marching up to the front, going to the trenches, going over the top, and then returning after they’ve been wounded, back through the lines to the casualty-clearing station behind the front. So it seemed like a very simple idea, and to be honest, I just wanted to draw. On a visceral level, it was just a pleasure to think only in terms of drawing.