"By September, 80,000 had been taken into custody in Texas, and an estimated 500,000 to 700,000 illegals had left the Lone Star State voluntarily.
Unlike today, Mexicans caught in the roundup were not simply released at the border, where they could easily reenter the US. To discourage their return, Swing arranged for buses and trains to take many aliens deep within Mexico before being set free.
Tens of thousands more were put aboard two hired ships, the Emancipation and the Mercurio. The ships ferried the aliens from Port Isabel, Texas, to Vera Cruz, Mexico, more than 500 miles south."
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