thanks to LegendarySpecies from ASIA forums for noticing this :) Basically, in your player profile, you have two new medals, both for a feature, that is not yet in the game: attacks on enemy clan strongholds (in Stronghold mode).
First medal – Retaliation
Second medal – Fortress Crusher
You can check these medals on your player profile as well, amongst the unfinished achievements. Someone got probably too fast with putting these on the portal when the Stronghold attack mode was delayed.