What is the author's style in Jacob's Ladder: A Story of Virginia During the War by Donald McCaig?

The story is written in fairly easy language and most readers should have little trouble understanding the story line and tracking the characters. One interesting aspect of the story is the conversation and statements by the blacks. There are words like "jine" and "ceptin,'" which are really "join" and "excepting." These words are written in the manner of language expected from the characters and the time period and add a level of credence.