Gemorah describes Jewish nationalists who rebelled against the Romans and inability of Rabbonim to control them (R Yochanan b Zakkai and his nephew).
You can read Gemora Gittin as how inter-Jewish fights bring external attacks when one side appeals to them against the others. As Henry Kissinger observed “Israel does not have international politics, only domestic”.
For a more learnt discussion, I suggest looking at R Berel Wein who brings both Jewish and non-Jewish sources.