Sudan's devastating civil war enters its fourth year this month, with survivors marking the grim anniversary through undelivered letters to loved ones lost to bombardment, drone strikes, and displacement. BBC Arabic documented testimonies from Sudanese families — including a mother in a displacement camp reassuring her late husband that their daughter has enrolled in university, and a woman who lost her father, sister, and brother to a single shell — reflecting what the UN's humanitarian office OCHA has called one of the worst humanitarian disasters in modern memory. Estimates from the conflict-tracking project ACLED and international investigations suggest more than 150,000 people have been killed, while UNICEF and WHO figures from early 2026 indicate that over 500,000 children may have died from acute malnutrition and lack of medical care since the war began in April 2023.