Does " that one small noise brought back the old days to the children’s minds more than anything that had happened yet." mean “the influence of that one small noise in bringing the old days to their minds was more than the influence of anything that had happened yet or, in other words, it really helped them to remember the old days”? Did I understand it correctly? 
Archery and swimming were the things Susan was good at. In a moment she had bent the bow and then she gave one little pluck to the string. It twanged: a chirruping twang that vibrated through the whole room. And that one small noise brought back the old days to the children’s minds more than anything that had happened yet. All the battles and hunts and feasts came rushing into their heads together.