The war server is for private 5v5 mixes (competitive play) that is put together by the community then authorised by a clan member. The server isn’t used as much as it used to be nowadays with csgo taking over as the main source for counter strike competitive play but occasionally we do a mix on the server when we find players and get enough to play. To stay up to date or to be involved within a mix I would advise you to join the steam group for mixes: https://steamcommunity.com/groups/hellmixes