Artillery is not used from bunkers and for troops when being amassed for moving forward will render bunkers useless. Always In a war scenario new bases and makeshift positions are created near the border!
We are already in the process of buying new art., missiles will never be used to hit art. positions and other ground troop positions! Its always Shelling or air attacks near the border!
IMHO, it will depend on how many new 155mm guns we buy, over and above the number of positions IA thinks it requires for shelling enemy positions and support ground troops in a future warfare scenario.
Sorry to barge in!
I find them useful in protecting artillery and other assets near the border in the event of full fledged war against enemy's artillery, rocket and missile barrage against our positions!
Spider is particularly Anti-Air i.e Anti-Aircraft, unlike Dome and David which are against Artillery and Low-level Projectiles...they are two different systems from two different purpose!!