Okay! Imagine that there is a big red truck with flashing lights and loud sirens. That truck is part of the fire brigade, which is a group of people whose job is to help put out fires and keep us safe.
Now, sometimes, a fire happens, and someone needs help. When someone calls the fire brigade, it’s like calling a superhero team! The phone call tells the firefighters, 'There’s a fire!'
As soon as they get the call, they jump into action. They quickly put on their special clothes, which protect them, and then they hop into their big truck. Whoosh! They turn on the lights and siren and drive as fast as they can to the place where there is a fire.
When they arrive, they use hoses filled with water to spray the fire and make it go away. They also make sure everyone is safe and help anyone who is in trouble.
So, a fire brigade on a call means that firefighters are going to help people because there is a fire, and they rush to the rescue just like heroes do!