Last Monday, three judges at the International Criminal Court in The Hague delivered their verdict on Ali Abdelrahman Kushayb: guilty on 27 counts of war crimes and crimes against humanity, committed in Darfur, Sudan, during 2003 and 2004. It was an exemplary case, meticulously prepared and presented. It took three and a half years from the opening session to the verdict. Seventy-eight witnesses gave evidence in court. Stacks of documents were presented and pored over. I was the first witness, summoned in April 2022 by both the prosecution and the defence – an unusual arrangement in a tribunal based on the adversarial system – to help the court establish agreed facts about the background to the case and the conflict in Darfur.