What made the indonesians dare fo face the british army military aggression

Because of the willingness to sacrifice, never give up, and have a strong determination.
I hope this helps

you need to listen to what our former Commander in Chief Gen. Gatot Nurmantyo said. He constantly reminded us that, bear in mind, this is the answer you are looking for :
THE BLOOD OF WARRIORS ARE RUNNING THROUGH OUR VEINS..WE INDONESIANS WERE BORN AS WARRIORS..AND THEREFORE WE NEVER BACK DOWN FROM THE BATTLES