the tomato fight started as soon as the first banger was bea

the tomato fight started as soon as the first banger was beaten.如何翻译?
The tomato festival is called "La Tomatina"in Spanish.It was the biggest and messiest tomato fight in the world.When we first got to the square where the festival took place,it was very crowded with people from all around the world,and many trucks were carrying tomatoes.【The tomato fight started as soon as the first banger was beaten.】Then everyone including me started throwing tomatoes at each other.I took red tomatoes and threw them at anyone that ran,moved,bent down,or turned around