One of the things that was drilled into me in the cadets was that you can delegate responsibility for a task, but not accountability. Ultimately, when things go wrong it's your fault not theirs. Perhaps they didn't have the skills, resources or experience required. Perhaps something unexpected came up. Ultimately, their failure is your failure as a manager and that's what you need to remember. Rarely was a bit of shouting required and when it was it was more about motivation than discipline.

"Praise people publicly, but discipline people privately" This goes doubly if you need to criticise someone who has to manage others