On October 12th a large group on Central American migrants left Honduras and began its trek north, largely on foot. Fleeing poverty and gang-generated violence, thousands formed into “caravans” which provide more protection than travelling alone or in smaller groups. Three weeks later they arrived in Mexico City where aid workers directed this caravan of 5,000 into the Jesus Martinez stadium, where they were permitted to rest for a few days and seek medical attention before continuing on to their final destination: the US border.

Jerome Sessini documented members of the caravan while they were...