You Wouldn't Want to Be a Roman Gladiator! - John Malam, David Salariya, David Antram
It's no secret that my daughter and I absolutely adore this series and this one is no exception. She actually declared this her favorite of all the 'You Wouldn't Want to' titles. As always, I have to caution that these are not for the faint of heart. All of the titles are incredibly gruesome, but this one is particularly so - lots of violence!

Also recommended:
You Wouldn't Want to Be an Egyptian Mummy!: Disgusting Things You'd Rather Not Know
You Wouldn't Want to Be in Alexander the Great's Army!: Miles You'd Rather Not March