What are the best kanji to represent these ideas?

"Lots of acorns being shot here"
"Arashi warning"

For instance, are these correct?
「戦」 and 「荒らし警」

In the case of 「荒らし警」, it will just an estimate that arashi are in that thread based on an algorithm.
It does not necessarily mean that it is guaranteed to be arashi.
It just means that it might be good to check if there are arashi there.