What military tactic did William T. Sherman famously employ in his march to the sea?

Scorched Earth policy

What is the day after Christmas called? What vehicle runs on tracks and says 'choo choo'? Which famous wizard went to Hogwarts and has a scar shaped like lightning? What classical composer wrote "The Marriage of Figaro"? Which navy vessel became infamous due to its explosion in Havana harbor in 1898?