First it sorts guilds into groups of 10 based on guild power a variable determined by Total wins. Next, the system randomly matches guilds within each group with protection against getting the same guild 2 weeks in a row. Lastly, sometimes there are errors while matchmaking and guilds from one group don't get a proper warfare set up. In these cases the system throws them into the open pool for all guilds which haven't been match yet and may result in a high power guild being matched with a weaker one.
Regarding old/powerful guilds that are lacking player activity, it is the captain and officer's duty to get their members active or find new members. If that's not possible, then simply don't GW and the guild will go inactive the following week. If the leader rejoins warfare after going inactive it's highly likely that they'll be matched with a new/less powerful guild.
Gw Group BracketsEdit
This can also be seen as how powerful/active a guild is. So in effect it's a ranking system but with values not displayed instead guilds will be first grouped in the first 10 and then then set of 10s.
On this page guilds under level 25 are shown but with no additional info other than they are in that group.
Also in no particular order, No way to individually place.
|Lions of Judah|
|the 13th legion|
|The Dawg pound|
|Tribe of judah|