The surprise attack came from Sun Tzu's Art of War, which was reflected in the battle of the long spoon in the Spring and Autumn Period and the Warring States Period. In this campaign, Lu adopted the strategic idea of "when the enemy is exhausted, we will fight the whole army", which is a typical case in which the weak army defeated the strong army. Qi Huangong led an army to attack Lu, but they were "high-spirited, defeated again, and all three lost" and were defeated by Duke Zhuang of Lu.
In this war, they thought they could defeat Lu with strong military strength. Who knows that Lu actually found out the idea of Qi, did not follow the routine, took the initiative to attack when the enemy's morale was low, and defeated the seven armies. It can be said that he saved Lu and changed history.
I think Battle of Red Cliffs was surprised, too. Although Cao Cao's military strength was the strongest, Zhou Yu won the war with his resourcefulness. Defeated Cao Cao's army with fire attack.
This also makes Cao Cao's beaten army escape, which is theoretically impossible. However, the right time, the right place and the right people are in harmony, but the wind direction is towards Cao Cao. Setting fire will naturally burn Cao Cao's army and flee.
So many great battles in history were unexpected victories, and the resourcefulness of generals influenced history and changed the future with an unimaginable result. This may be the magic of history.