Israeli troops are massing for what’s widely seen as all but inevitable: a ground invasion of Gaza. The public and the national security establishment in Israel are demanding retribution for the attacks by Hamas militants that claimed more than 1,000 Israeli lives over the weekend. But a ground invasion would be complicated by Gaza’s dense population, its complex underground network of tunnels and the danger it would pose to Israelis, Americans and others being held hostage.Israel-Hamas war live updates“The problem is that it’s basically house-to-house fighting once you...