It was indeed not difficult because the difference in numbers was too great.
When Zhan Yu found Mu Yangling and the rest, Mu Yangling was leading Bai Qing's men around in circles. As the trees were dense, it was not difficult for her to hide.
Thanks to her ten years of practice, although she wasn't too skilled, she could still use her qinggong to dodge quickly.
By the time Zhan Yu and his men found their way here, Bai Qing was about to be driven crazy by Mu Yangling. This was because as they walked, the people walking at the back kept getting their necks slit.
In response, he had his men walk forward with their backs against each other, but then they started getting attacked by arrows. And when they attacked back with arrows, the other party had already run away.