What event causes the windmill to fall for the first time?

The windmill falls for the first time due to a storm, which highlights the vulnerability of the animals' hard work and the challenges they face in their attempts to build a better society. This event symbolizes not just the physical destruction of their labor but also serves as a reminder of the external forces that can disrupt their plans. The storm represents natural adversity, contrasting with the man-made obstacles and conflicts that the animals also contend with.

In the context of the story, this event underscores the theme of resilience. The animals are determined to rebuild the windmill despite this setback, showing their commitment to their vision of a better future. The storm's impact also reflects the unpredictability of their struggles, reinforcing the idea that their dreams and aspirations are continually threatened by forces beyond their control.