Clash-of-clans – What does this green/white icon in clan chat mean

How are clans matched for a clan war?

Clan wars matchmaking matches clans based on the strength of their members. Unlike multiplayer battles, trophies have no influence in determining your clan wars opponent. After an opposing clan is found, the war immediately starts. There’s no “nexting” in clan wars matchmaking. In addition to that, any inactive members in a clan will be treated as an active member.

How is strength calculated in clan wars?

Strength is based on each member’s attacking power (troops, army camp capacity, spells and heroes) and defensive strength (defense buildings, walls, traps and heroes). Different layouts and base designs do not affect strength. The only way a member’s strength can be changed is if they upgrade their troops, defenses, spells, etc.

So if you win a lot of matches, you will not be facing any harder clans. Only if you upgrade your base, attack or defense(the strength), will you face harder opponents.

Source

The red simbol means that the player does not want to be in a war. This is a feature of the latest update in which you can choose to be in war (using a green shield) of not beeing in war (using a red one).

this shield can be seen by everybody including the clan leader which, using this information, can now choose who to take in war and who not.

you can change this at your profile screen.