It could be worse, the wildland's overlord could've laid siege to your fortress personally with support of it's entire wildland army.
I consider you're pretty lucky that they're mostly weak shrills with few troublesome worms.. hope you have a life hero in the fortress, oh wait nvm you rolled empire. YOU INFIDEL!
*Joins the shrills to purge the land of empire folks.*
Roleplaying aside, I think you can survive it with your fortress as long as they don't attack in a single turn with everything.
But judging from the screenshot's information available to me, I have to say your fortress is toast because I only can see one army? And i'm willing to wager that it's in southwest corner of the minimap.
You have 1351 gold.
You could've had some wimpy scouts lighting the land up for invasions.
You could've had like two armies for homeland defense. But.. you're researching instead of building troops. I wonder if the monsters calculated the military strength and has determined that you is the weakest out of all the factions that hide behind the faction power score for protection.
Lack of soldiers in the screenshot bugs me. I wish you godspeed on defending your lands from a massive monster invasion.
It's just that, When I noticed the lack of soldiers.. I couldn't help but notice it.
And then after when I noticed it, I couldn't help myself but tell you that I'm surprised that your empire haven't succumbed to an barbarian invasion.
Finally when I told you that your puny empire hasn't fallen to barbarians yet, I couldn't help myself but start forming armies to help myself to your tasty defenseless cities.
XP