the most conspicuous early sign of attack

例句：

1. 1. The attack on the city was a surprise.
   对城市的袭击是出乎意料的。
2. 2. The military attacked the enemy's positions early in the morning.
   军队在黎明时分攻击了敌人的阵地。
3. 3.The government's response to the attack was swift and decisive.
   政府对袭击的回应迅速而果断。