Wild Boy by Thomas Fall, 7th Scholastic paperback printing, TX1348, 1976, 128 pages. Illustrated by Leo Summers.
DESCRIPTION: “Roberto lies in the dark, tensely watching the guard. He must escape! His grandfather, alone in the desert without water, will die if Roberto doesn’t reach him soon. Will the guard never fall asleep
Suddenly Roberto springs up. It’s now or never! He grabs a water canteen from a sleeping soldier, runs toward the horses…” (from the back cover)