I lived in Linden hall in the later 70s and we used to get into some pretty good snowball fights with the frats across Lincoln Way. ( Mostly Phi Kappa Alpha). On one occasion there was a good sized crowd and and cops eventually came and broke it up. One crusier stopped on Lincoln Way and while everyone from both sides was throwing at it they came in behind us.
2 kids on out floor were taken downtown but not charged.
We never threw bottles but we did always keep some oranges and apples from food service handy "so we has something to throw if we ran out of snow".