If you weren't attacking Fissoa, D'Haran forces wouldn't be preparing to defend their ally against your attacks.
It's not "attacking" when it's the Aurvandilians who are on the offensive, we usually refer to that as "defending". It's a cute slight though, implying that D'Hara is the aggressor when in fact it's Aurvandil who is at fault.
Are you playing now? And yeah though no need to continue arguing when he already agreed to that.