Combat in well defended built-up areas and in underground fortified facilities requires a large-scale order of battle quantitatively greater than anything known in the past. Meeting this challenge depends on the right integration of an elite, top-quality strike force with a large-scale quantitative mass at a medium level of quality. And while the IDF has been renewing and strengthening itself in those regards, when it comes to ground combat, where a quantitative mass is critical, a worrisome gap is widening.