Which supporting detail from The Great Fire conveys the main idea that firefighters alone were not able to contain the fire?

Question

Only one group of firefighters responded to the fire.
Firefighters from Wisconsin were asked to help.
Firefighters asked spectators to help, and many did.
The hose carts that firefighters used failed at critical moments.

Answer 1

The supporting detail from The Great Fire that conveys the main idea that firefighters alone were not able to contain the fire is:

Firefighters asked spectators to help, and many did.

This detail highlights that even the firefighters recognized the need for additional assistance beyond their capabilities, indicating that they could not contain the fire on their own.