Do the Dwarves ever show any bravery in protecting Bilbo? Do any of their actions affect or change our opinion about their nature

I recall that in chapter two the dwarves do try to fight the trolls when they go looking for Bilbo. The trolls argue over Bilbo's fate and when they are physically engaged with one another, Bilbo escapes though not without bruises. Unfortunately, the scene does not end here because the dwarves grew impatient while waiting for Bilbo and, hearing the trolls' noises, decided to approach the fire. Trolls hate the sight of dwarves and the appearance of Balin sets Tom and the other trolls on a rampage.