But the calls fell far short of the international chorus of criticism that accompanied Israel's previous incursions into Gaza in 2008 and 2012. That, however, may be due to the relative accuracy of any single major tragedy so far to mobilise international opinion around - unlike in 2008, when the opening day of Operation Cast Lead saw several dozen Gazan police cadets killed by an Israeli drone that strafed their graduation ceremony. "Presumably there have been no voices because of the extraordinary accuracy of the Israeli strikes," said Martin van Creveld, an Israeli military historian and strategist.