Yang Zhenshan escorted Xu Wanfu, Xu Lu, and others back to the garrison office, then ordered Song Dashan to take a dozen or so Yang disciples to the garrison.
This time, he took down a dozen squad leaders in the garrison, which coincidentally allowed the accompanying Yang disciples to fill these vacancies.
With these Yang disciples present, Yang Zhenshan could firmly control the garrison. Even if Han Cheng might harbor ulterior motives in the future, he wouldn't be able to manipulate the garrison for his own purposes.
There was a cell in the garrison office, but it was only for temporarily detaining prisoners. The garrison office had no authority to deal with prisoners; to do so would require going through the Guardian Department and the approval of the garrison commander.
Yang Zhenshan first detained the suspects. As for the evidence, it could be collected slowly.