Please do not read the one by Max Mueller, since he is from colonial era whence they had only one objective = show Vedic literature to be external to India.
Instead, the best commentary I read on the battle of 10 kings in Rig Veda (as well as the much earlier battle of 5 kings in Rig Veda) is by Dr. David Frawley.
It is called "Gods, Sages and Kings: Vedic Secrets of Ancient Civilization". I bought it and read it and I liked the part where he gave sanskrit slokas with english translation to prove his point (that Vedic culture was native to the land of seven rivers between Indus & BhramaPutra rivers).
You can get it from here (I am NOT an affiliate or a seller on Amazon, and I am NOT affiliated with seller at this link or with Dr. David Frawley): https://www.amazon.com/Gods-Sages-Kings-Secrets-Civilization-ebook/dp/B002OB4RZM
If you live in the west, you will find a copy of it in your local public library, please search and you can borrow it from your local public library as well.
You can also read my post on Quora.com on this topic here: