Though largely a civil war, Yemen's four-year-old conflict has drawn combatants from around the region, as the warring parties look to their international allies for support.
While Saudi and Emirati troops backing the government of Abd Rabbuh Mansour Hadi have been most prominent in the fight against the rebel Houthi movement, another country's fighters can be seen more readily on the frontline: those from Sudan.
Yemeni fighters say the Sudanese they fight alongside are some of the toughest troops in the Saudi-led coalition battling the Houthis.
'The Sudanese regime threw its forces into the ground warfare, where many of the coalition states refrained'
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