I'm sure everyone knows what's going on right now in Eretz Yisrael with the rockets being fired at the Israeli population from Gaza and the response of the IDF.
I have heard many people say (charedim) that there is no need for the "Iron Dome" system that is in place to help shoot down in coming rockets and that there is no need to fight back. If we strengthen in limud haTorah then things will stop on their own.
While everyone agrees to strengthen in Limud HaTorah and Tefillah in order to bring more zechusim (merits) to the situation and that we trust HaShem will keep us safe. Still doesn't it speak about in Chazal and the Rambam about times when to go to war or fight back to save ones life (even going to battle on Shabbos.) However I'd like to have some source for this. Where are some examples (from Chazal or the Rambam or other writings) where they speak about the idea of going to battle (even on Shabbos) or that one should absolutely defend himself when attacked, etc.