According to an aspect of the invention, there is provided a weapon system for use on a vehicle, comprising: a control system, the control system configured to, in response to a determination that a line-of-sight from the weapon system to a target of the weapon system is currently, or going to be obscured, trigger an alteration of a configuration of the vehicle such that the line-of-sight to the target is not obscured. Thus, the weapon system can ensure a line-of-sight of the target, allowing it to be successfully engaged.