Fighting warriors ensure victory

והיה המחנה הנשאר לפליטה  על כרחו כי אלחם עמו רש"י It's not the Davening but going to war that guarantees survival According to Rashi, the only way to ensure the survival of the other camp is by engaging in מלחמה rather than relying on דורון or תפילה. ?* The אבן עזרא argues on Rashi & holds there is no guarantee of partial survival even with מלחמה. *I don't have the Pshat in the Rashi. yet.