From the two interactions with them, one can see.
He Meng's group consisted of fifteen people, who should have only been active in the Arrow Bamboo Forest, but they were startled by a group of rodents and came out;
Yuwen Dao's group had a bit more, over twenty people, but the problem was, to hunt down that Demon Sheep, they lost quite a few.
From these two times, it's clear the Mirror Immortal Camp is unfamiliar with the situation on Redwood Ridge, so every time they deploy very few people, and all are elites from the Earth-digging Realm hunting team.
Moreover, the two camps don't have any deep-seated hatred; the rodent incident was clearly He Meng's provocation, and the only existing dispute is over the ownership of the land from Lu Shang Camp.
"The best scenario is that the harsh words I had Yuwen Dao bring back have an effect, and they behave for a while, not venturing to Redwood Ridge. But the likelihood of this..."