Burroughs is better known for his Tarzan books, but he actually shot to fame with the John Carter books (starting with this one) about the adventures of a Civil War veteran from Virginia on Mars.
These books have a big role in SciFi folklore. While the adventure is engaging, I found the character of John Carter himself (the novel is narrated in the first person) a bit off-putting. He is rather full of himself as only an expert in self deprecation can be. Perhaps it is just a bit too dated for me. So while the old fashioned writing style was manageable, I was a bit disappointed with the whole thing due to the annoyingly condescending attitudes displayed. It is high adventure in any case, complete with absurd situations and plenty of flirts with deus ex machina.