Were there siege engines of some sort? were there very effective walls around many cities? would cities be conquered mainly by large numerical advantages?
You may be interested in this old comment of mine regarding siege warfare in the Late Post classic (i.e., Ye Older Azztek Times): https://www.reddit.com/r/AskHistorians/comments/1coe7f/siege_warfare_in_precolombus_americas_how/c9ixz4h/