So, I just took a peek at Hierulf's borders.
And.... that's a lot of PD. Is it even possible to get through that kind of PD?
Yes, But and this a a Big but, the one and only time I tried against PD like this, was testing with an ally so its not like he threw everything at me. I sent 30 fleets of 100 battleships and 5 black birds at the planet, I had about 500 battleships left at the end. In a real war trying to take it on would be slow going an invite a lot of counter attacks.