"Yashima" mission in Minamoto Yoshitsune was way too hard in a campaign deemed as "Easy."
One single mistake on my part and I had to hold two factions with Minamoto aloneon a bridge. Thankfully, as a hero he has a lot of stats boosted, powers and being a pike unit honestly helped to boost his defense but it was way too close. The AI spammed monks and it dragged for way too long.

I remember the "Mongol Invasion" mission was very fun, I play it now.