Yeats is talking about an event that has brought forth destruction, destruction of the world before the Easter Uprising.

叶芝描绘了这样一个事件,它带来了毁灭，对复活节前世界的毁灭。

耶鲁公开课 - 现代诗歌课程节选

The world dissolves. So corruption and injustice and lawlessness and violence inevitably bring about destruction.

世界将被毁灭，而人类的堕落，目无法纪,暴力成性，势必会带来这种毁灭。

耶鲁公开课 - 旧约导论课程节选