Are there any true versions of the Mexican-American War 1846-1848 either online or in printed forms?

I had some doubts about some of the battle accounts and numbers of forces of the Mexican War, based upon many of the books about the subject. However, it could be that the thousands of US and Mexican troops mentioned in these books, during the war, were reserves, they did not see much combat. I wondered why many of the books of the Mexican War did not mention the reserves or details about the battles.Are there any true versions of the Mexican-American War 1846-1848 either online or in printed forms?
You could google it or check out your library for the information.





Hope this helps!