There isn’t. There also isn’t a campaign. There’s just the game which is more or less an open sandbox world simulation.
@robc04: Every new game always starts with your company in a scripted tutorial introduction contract. The first battle will always have all of your men die during the scripted part of the starting battle. Once the script ends, you get to control the remaining 3. Those 3 are the core of your company going forward which you will need to rebuild. Once you finish the battle (Hoggart always runs away), return to town to get paid and you can then take the 2nd part of the contract to kill Hoggert.
There is no real tutorial but the Overhype videos are a lot of fun to watch. You’ll learn everything you need to know from their Let’s Plays.