Another day, and yet more worrying news from the frontline: Ukrainian troops are firing as many as 6,000 artillery shells a day to try and beat back Russia’s new offensive. It is an expenditure rate the West is struggling to feed; so high that Defence Secretary Ben Wallace has said that Ukraine’s forces could run out of ammunition unless they use it more sparingly. His comments remind us of an essential truth: that brute force and, critically, the ability to sustain and replenish it over an extended period, is historically what wins wars in the end.This rule counters the orthodox...