Ghazwan al-Atman thought he had found refuge in Manbij after years of displacement, but he now fears his family will be uprooted once again as a threatened Turkish onslaught looms over the Syrian town. President Recep Tayyip Erdogan of Turkey has repeatedly vowed to launch a new offensive in northern Syria in what he says is an operation to protect his country from Kurdish militias who have been waging a decades-long insurgency against the Turkish state. Turkey has launched a string of offensives in Syria in the past six years, most recently in 2019 when it conducted a broad air and ground ass…