A battle that is hammering Khartoum and dragging Sudan to the brink of civil war pits the army chief and his regular forces against the streetwise fighters loyal to a former warlord.
Army head General Abdel Fattah al-Burhan controls heavy weapons and the airforce, but his soldiers face a irregular force led by the wealthy, one-time militia leader General Mohamed Hamdan Dagalo, better known as Hemedti.
