The attack began shortly after a farrier arrived to shoe the horses
The attack began shortly 是主句 后面是after引导的时间状语从句,
a farrier(主语) arrived (谓语)to shoe the horses.(to do 不定式做状语表目的)
翻译:在一个兽医钉完马掌后,袭击(attack)便马上开始了
在一个兽医钉完马掌后,疾病便立刻发作了(attack暗指heart attack)
因为没有读全文 attack 有多种理解.你觉得哪个更贴切呢?