" When did this new revolution gather head" ?

“这场新革命是什么时候聚集起来的” ？

While he was thus tortured with uncertainty, the sky was overspread with clouds, the day vanished from before him, and a sudden tempest gathered round his head.

正当他百般纠结时，刹那间，天空乌云密布，刚才明晃晃的天空旋即变得晦暗混沌，突如其来的暴雨云团在他头顶上空急遽聚集。