Honestly speaking, what the eunuch has just said is exactly what these commanders here wants. They have no interest in eliminating these rebels fast, not only because of the worry on the possible loss of their precious manpower in a sudden and intensified battle, but also because through war these commanders can have a little bit of extra income as compared to peace times. Since the eunuch, on behalf of the Sultana Dowager, wants to drag the war on, they don't mind at all.