There are a lot of games out there that are able to be used by GWR.
The general GWR format is a leader, a co-leader, officers, members and initiates. This hierarchy system when adapted is used to make group combat as effective as possible.

Currently we are discussing expanding into Mount & Blade: Warband, with our own server. Do not expect to be able to show up and break a few rules as easily as other groups. The server will be posted initially on Native, with changes based on events. A steam group will be made with a standard format and platoons of infantry/cavalry with rules behind each.