When I launched the “Explainers” section of WOLA’s renovated colombiapeace.org website, I wrote that I “plan to add approximately one per week between now and June.”

That was on March 25—18 days ago. I’m pleased to say that finally, I’ve posted a fourth one.

This one took longer for a reason, though. It’s a huge topic: an overview of the National Liberation Army, ELN, Colombia’s largest existing guerrilla group. The Explainer whirls you through the ELN’s unfortunate history, its command structure and way of operating, its geography, its revenue streams, its awful human rights record, and its experience with peace talks. All in a concise 5,400 words—but with lots of photos and maps.