>>96396537
No, the Perty Daemonhood siege was the Iron Cage, anon. That's Scouring Era.
On the actual Siege of Terra, Perty just got disillutioned Daemon Morty got put in command, as this was symbolic. Yes Fulgrim had wounded him for his ascension ("he'll pay when the opportunity arrives"), and yes he had been sent to fetch Daemon Angron ("he was always a rabid beast"), and yes, his brother Magnus was now a daemonic creature ("he was always messing with things he shouldn't be").
But when Daemon Mortarion was put in charge of the overall siege effort, that was different: It was Devil using Man, and not the other way around, and even Horus himself couldn't tell (and it does get him killed).
Perty had no daemonic patronhood - it was good that he left.