Defensive, static and predictable solution cannot give you permanent victory in this warfare. Artillery is ineffective in mountainous terrain due to crest problem and numerous dead grounds inside enemy terrain. Artillery cannot engage targets effectively. You can only use artillery as support weapon. Artillery is supporting arm and i dont think it can alone prevent any cross border terrorism. Guerrilla ( a member of a small independent group taking part in irregular fighting, typically against larger regular forces ) warfare can effectively be fought with the tactics of guerrilla warfare. Use similar tactics of raid and ambushes on Terrorist inside Afghanistan as they are using against us. In my opinion conventional tactics and strategy to encounter sub conventional or guerrilla warfare is stupidity.
My suggestions
1. Fight them in Irregular Fashion
2. Organize small independent raid and ambush parties all across the durrand line.
3. Select member of these regular raid and ambush parties from local or nearest towns.
4. Give them hight tech wepon ammo like SSG.
5. Give them perks and privileges better than SSG and regular army.
6. Post them permanently in same local areas so that they can make best use of knowledge about ground and terrain.
7. Give them advance specialized training of sniping , hunting and survival.
8. Task them to infiltrate and hunt terrorist inside Afghanistan
9. Give them full initiative to search , select and plan for the operations.
10. To avoid protest of Afghan government on initial stages keep them as a covert force and launch these operations as covert operations.
11. Raids and ambushes of this covert force on terrorist hideouts should be three times more than terrorist incident in Pakistan.
12. This is offensive strategy to deal with them.
@Horus