See Amanda's review. Written in about 1945. When I realized this was a YA novel, I revised my stars from two to three.
How many guys were in the Pony Riders, I'm not sure. Memorable is wisecracking, and whining Stacy, the Fat Boy; the all-wise Professor; the others are forgettable in this book; probably five. Gilligan's island's writers' probably read this first!
There are constant references to the awful, hated Germans in Mexico (!!); except for the Professor, the Pony Riders could not wait to join up and go kill them, and, in this reading, one Zeppelin, who is now a loyal American and destroys the Iron Cross that was given to him back when he was a loyal German. Odd, what we believed, so strongly, back then.