In episode 5 of season 6, there is a battle scene between a Child of the Forest and a White Walker: click here to watch the scene.
The Child of the Forest is using ordinary weapon, not made of dragonglass. I find it weird, because since they are those who created the White Walkers, the Children of the Forest should know the best that dragonglass weapons can destroy them.
Is there any explanation for this odd behavior? Using dragonglass weapons might not have saved them, but surely help to delay the attack and buy Bran precious time.