At noon, I found a bunch of small spiders on the spider web at the door. Is there a moral?

1794 In the late autumn, Napoleon's army attacked the Netherlands, making rapid progress and approaching the Dutch fortress Utrecht. In the face of the enemy's onslaught, Holland had to order the bombing of all the main roads and bridges leading to the city. However, this still can't stop the powerful artillery bombardment of the French army. Utrecht is in danger! At this critical moment, the commander of the Dutch garrison in the city came up with a wonderful plan to stop the enemy's attack: open the sluice gates of various canals and use the river to stop the French attack; As soon as the gate was opened, the hoses roared like wild horses, and the Val River rose, forcing the French army to retreat. When the French army began to retreat, the French army commander Charles Piglio (Napoleon's teacher) suddenly found that under the eaves of the General Staff, several spiders were busy weaving webs. He couldn't help exulting when he saw it, because the experienced Charles Piglio was fully aware that it would herald the arrival of dry and cold weather. So, he first ordered the troops to continue to retreat, and suddenly ordered: "The troops are on standby immediately!" ! Napoleon's army was quietly lurking, ready to launch a new attack. These "clues" seem to be tiny clues, but they have a decisive influence on military operations. Sure enough, the "Eight Diagrams Array" set up by this little spider has become a "forecast table" for the future weather. The next day, a cold wave hit and the river froze overnight. At this time, Napoleon's army seized the fighter plane and turned to attack. Holland's brilliant idea of opening floodgates and releasing water came to nothing. Napoleon's army ......