From publisher blurb:
This document contains a variant mechanic for 5th Edition, that replaces the Fighting Styles class feature (present on the Fighter, Paladin, and Ranger) with a list of Maneuvers that can be performed.
These maneuvers are inspired by, and many are reworked from the Player's Handbook Battlemaster archetype for the Fighter. As a result, the mechanics presented here are not compatible with the Battlemaster but I think you'll find yourself enjoying them more!
Also included is a Revised Champion archetype, taking the Player's Handbook Champion and giving it an upgraded toolset; as well as a set of two unique maneuvers granted to many of the official Fighter archetypes.