To best counter the Heavenly soldiers, it is advisable not to let them form battle formations. Instead, leverage the Demon Clan's strength in guerrilla warfare to fight them.
The Heavenly soldiers were aware of this situation too, but because Yin Qi had just ascended to his position and was trying to stabilize it, he had made large-scale adjustments. Some of the veteran soldiers had been sidelined by him, which meant these Heavenly soldiers lacked the usual synergy, therefore, they were more than a beat slower than before.
This slight delay immediately changed the situation as countless Heavenly soldiers, unable to form their battle formations in time, were slain by the Demon Clan. As their numbers dwindled, even their formations, when finally assembled, were significantly weakened, and they soon found themselves at a disadvantage.