Robert Heinlein's juvenile novels. You'll need to be careful to avoid his later works, like Stranger in a Stange Land, the Moon is a Harsh Mistress, Time Enough for Love, etc. that are very inappropriate for a child.
But Red Planet, Farmer in the Sky, Space Cadet, the Star Beast, the Rolling Stones, Between Planets, Rocket Ship Galileo and Starman Jones are all great adventure stories appropriate for children. They don't have battles per se, but most have some fighting.
-Marcy
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