In Frontlines: Fuel of War, one of the key features is the use of the Frontline. This frontline is used to visually represent where the line of control is for your team, and what control points you will need to capture to move the line forward.
The use of the Frontline is the main feature for game play in the game mode Frontlines.
In multi-player, the Frontline is used to focus gameplay into one lateral area instead of scatterring it across the entire map. This way, players will congregate towards the currently active control points instead of spreading out across every control point as there will only be a few active at a time.