Hundreds of thousands of German ghosts may disagree.
Deliberate savaging of civilian targets was something more typical of the German side (Rotterdam, London, the V-weapon offensives, the Scharnhorst and Gneisenau's gratuitous shelling of Deal during their Channel breakout, Ouradour, Lidice, half a hundred Polish and Russian towns). However, any fairminded person would have to admit that Sherman's march to the sea did adumbrate this kind of warfare, which had no precedent since the Thirty Years' War, or even the Hundred Years' War.
What about what the British did to the highlanders?
Okay, the British "puttings down" among the Scots borderlands and among the Irish after the Boyne would be another couple of cases.