Does "For one day spent, Cao's cruelty to abet:" mean
Does "For one day spent, Cao's cruelty to abet" mean "For one day spent to abet Cao's cruelty"?
Context:
Hua Xin furthered Cao Cao's foulest scheme: Breaking down the wall, he seized the queen. For one day spent, Cao's cruelty to abet: A name forever cursed, "Dragon Pate."
Another poet praised Guan Ning: Liaodong still keeps historic Guan Ning House ...