Ammunition availability can make all the difference in a war, but only if it makes it to the troops on the front, rather than being destroyed in storage. Over the course of several days, Ukraine recently succeeded in striking two Russian GRAU arsenals deep in Russian territory and a separate depot and storage facility, causing massive destruction and destroying thousands or tens of thousands of tonnes of Russian munitions. In this episode I ask how long-range drones were able to destroy what were meant to be, in many cases, hardened targets, why the bases may have suffered the damage they did, and what this may all mean for the war going forward.