For five days now hundreds of Central Americans -- children, women, and men, most of them from Honduras -- have boldly crossed immigration checkpoints, military bases, and police in a desperate, sometimes chaotic march toward the United States. Despite their being in Mexico without authorization, no one has made any effort to stop them.

Organized by a group of volunteers called Pueblos Sin Fronteras, or People Without Borders, the caravan is intended to help migrants safely reach the United States, bypassing not only authorities who would seek to deport them, but gangs and cartels who are known to assault vulnerable migrants.

Organizers like Rodrigo Abeja hope that the sheer size of the crowd will give immigration authorities and criminals pause before trying to stop them.

"If we all protect each other we'll get through this together," Abeja yelled through a loudspeaker on the morning they left Tapachula, on Mexico's border with Guatemala, for the nearly monthlong trek.

When they get to the US, they hope American authorities will grant them asylum or, for some, be absent when they attempt to cross the border illegally. More likely is that it will set up an enormous challenge to the Trump administration's immigration policies and its ability to deal with an organized group of migrants numbering in the hundreds.

The number of people who showed up to travel with the caravan caught organizers by surprise, and has overwhelmed the various towns they've stopped in to spend the night. Pueblos Sin Fronteras counted about 1,200 people on the first day.