Now that she knew the Governor of Heyun County was in league with the second prince, Yan Lin, and had secretly mustered his troops, preparing to annihilate her at the valley entrance, Su Rong naturally wouldn't let the governor of Heyun County off the hook.
So, she instructed Fen Ling to arrange for contacts with the Governor of Linyang County, Sun Chun, and then lay in ambush, waiting for the two thousand five hundred soldiers of Heyun County to cross the border into their trap.
Governor Sun Chun of Linyang County was a supporter of the Eastern Palace, which conveniently aligned with her.
When she decided to take a detour at the valley entrance, she whispered her instructions to Fen Ling. As such, after Fen Ling's arrangements, Deputy Zhang Yu was captured. Even though the Governor of Heyun County he had instructed, Cao Zhang, was in the governor's residence, he naturally couldn't escape either.