Veteran author Lloyd Alexander's first book shows the promise that would soon make him one of the most well-known authors in children's literature, as well as some rookie clunkers. There's a sweetness to this story that has held up through the years, and a gentle diffidence that keeps the story at some emotional distance -- both a strength and a weakness. The scary parts are, well, not very scary, and the humor is mildly amusing. It's interesting, well paced, and reassuring, a good bedtime book that won't keep young readers up late worrying. Think Mr. Peabody and Sherman, and you won't be far wrong.

Perhaps because of when it was written (1963) parts of it are uncomfortably stereotyped, especially the Japanese chapter. The biggest clunker is the ending, the old was-it-all-a dream-or-wasn't-it bit that is more tired now than ever, and was never a satisfying way to end a story. But up until then the book is pleasantly fascinating and may prompt some research, which may yield surprising results

From the Book:
"O Mars, god of battles, mighty Jupiter, father of the gods," he began, "or whatever it is the regimental augur says. Shall this boy and this cat march with us?" He gripped the shield and held it out flat in front of him. "Give us a sign."

Gareth, who had been watching the centurion with interest, leaped from Jason's arms and landed in the center of the shield. Arrius cheered and tossed his helmet in the air. The centurion raised the shield high in triumph. Gareth stood balanced on it, his tail like a banner, and with a special curl to his whispers that, Jason knew, meant he was feeling exceptionally pleased.