Silnaria is attacking Tara and trying to To Menedor. Menedor choosed to change allegiance to Tara as its Landlord couldn't trust Silnarias current ruler. Silnaria has now showed what it has become. Attacking its form ally.
Show me anything that indicates that Tara and Silnaria are allies. Literally anything. The two realms aren't even at peace.
Any suggestion that Silnaria is attacking Tara is a load of crap.