Not sure if you watched Maddow’s show on 10/19, but she had a long opening segment trying to piece together this very puzzle. Chad’s troops apparently have a well-earned reputation for being the fiercest, most reliable anti-terrorist force in the region, and probably provided protection for US Special Forces on many occasions. Then the trump administration added Chad to the travel ban - although no one can explain why - and Chad withdrew from protecting us.
A week later, the ambush leaves 4 dead and many wounded, with only French and contract troops to evacuate our guys. And they left one behind for two days until he died.
Sure would like to know what the hell happened.