On Yemen's desert battlefield a war with global consequences is being waged.
The BBC's Orla Guerin saw the impact firsthand when she travelled with southern national security forces to frontline positions where they've been battling Houthi fighters.
Yemen's civil war over expanses of desert land has had devastating consequences for civilians and fighters.
One military hospital in Aden reported more than 50 casualties arriving in a single day – many with gunshot wounds, and several needing amputations.