Actually, while Zheng Fan was still at the Tian Residence helping Lord Jingnan's family collect the corpses, the various military commanders in Yinlang County had already received orders from Lord Jingnan.
The order was simple: do everything in your power to harass Qian State!
Nanwang City was the first line of defense and also Yan State's primary southern stronghold against Qian State. However, at this time, on the border between Yan and Qian, besides Hui Wenzu, there were eight other general officers.
They had been redeployed forward from their original defensive zones and garrisons. This meant that here, including Hui Wenzu, there were a total of nine general officers, and the number of subordinate commanders under them was even greater.
So, when Lord Jingnan's order was issued, these numerous commanders swarmed out like hornets, stinging at Qian State's border defenses.
The war, in fact, had already begun before Zheng Fan returned.