Siege Station
Siege Stations are pre-generated regions in space, that can be captured by nations through military force.
There are 24 siege stations on Horizon's End, spread across the space worlds Asteri, Regulus, Sirius, Ilios, and Horizon. Stations can be sieged by any nation during their siege window (see "Sieging" section below); however, doing so is typically considered by most nations on the server to be an act of war, and thus is typically reserved for nations in active conflict.
Sieging
All siege stations have an assigned 1-hour siege window in which the station is vulnerable to be sieged. As there are 24 siege stations, there is always exactly one station available to siege at any given moment in time. Which station is presently available can be checked by running the command /siege while outside of any siege station radius.
To siege a station, a player in a ship sized 2000 blocks or more must run the /siege command while inside of the station radius. Doing so will send a public message in chat and on Discord (alerting defenders to your actions, if they did not notice you previously), and start a 15-minute siege timer. The siege succeeds if the timer reaches 0; the siege fails if the sieging ship is sunk or exits the station radius.
Members of the defending nation or its allies may defend the station. The presence of any defending ships sized 2000 blocks or more inside of the station radius halts the countdown of the timer. Defenders and attackers must therefore engage in SvS until only one side's forces remain in the station radius (potentially with the exception very small ships such as starfighters).