The greatest advantage of having a mature battlefield surveillance system is that it allows commanders to directly observe the battlefield, to know what's happening, and thus to make more accurate judgments.
So far, the situation at Guisui Institution No.1 is still good; zombies trying to breach the minefield have to pay a heavy price.
A quantitative change leads to a qualitative change; when the number of zombies reaches a certain level, the problem becomes much harder to solve.
But since it's a qualitative change caused by an extremely large quantity, then fight quantity with even greater mass.
For example, setting up aerial bombs on the path the zombies must take.
