During the Vietnam war (or the American war, depending on your perspective) the North Vietnamese got very skilled at concealing artillery pieces, even inside ca

During the Vietnam war (or the American war, depending on your perspective) the North Vietnamese got very skilled at concealing artillery pieces, even inside caves, and then rolling them out, blasting off a few rounds, and whipping them away again. I don't think there's currently any kind of instant-reaction force that could deal with the low tech threat of thousands of simple guns all firing simultaneously. Well, except for nukes.