THE BATTLE, in the end, was mercifully short. The 500,000 inhabitants of Mekelle, the capital of Ethiopia’s northern region of Tigray, were spared a large-scale bloodbath. On November 28th Abiy Ahmed, Ethiopia’s prime minister, declared victory over Tigray’s ruling party, the Tigrayan People’s Liberation Front (TPLF). A military operation started a few weeks earlier was complete, he said. This came two days after he announced an assault on the city that the army had earlier warned would brook “no mercy”....