The current permanent fortification had been excavated into the rocky mountain. At the same time, it was internally anchored and reinforced with multiple layers of reinforced concrete, and the construction process was the same as the tunnels with a high degree of sturdiness.

The possibility of the other party blowing up this kind of fortification using the power of their towed howitzers was basically zero.

It would only be possible for them to blow up this fortification if they used high-end