the queen often scolded for his fearfulness. she thought all people of golliver country to coward. how did gulliver prove his bravery

The queen of Brobdingnag, thought of humans as cowards and would scold Gulliver quite often for his fearfulness. Hence, in order to prove his bravery Gulliver battled the flies of Brobdingnag with his sword, and sliced them into two with it.