How common was what we would call terrorism in ancient Rome? They had a lot of territory under their control and, as I understand it, they weren't very popular among many of the peoples that they conquered.
I got to thinking about what the American military contends with in the countries it has a presence in. The US has a lot of military bases in a lot of countries and, like the Romans, American's aren't very popular in a lot of places. There are militias that attack US troops overseas that the united states label as terrorist organizations. Did these kinds of organizations exist in the Roman empire? How/how effectively were they dealt with? Were these rebels labeled as terrorists or something similar by the Roman government?
EDIT: Grammar
So I think what you mean by "terrorism" is essentially irregular attacks on the Roman Army in different parts of the empire. Besides not being precisely defined, "terrorism" often refers to attacks on civilian targets, which doesn't seem to be what you're asking about.
Anyway, my field of study involved lots of revolts against Rome. These involved different issues, none of which I'd really call "terrorism". The first was rioting--Josephus describes mass demonstration against Rome after incidents of some kind, which sometimes turned violent. But the main form of violence was revolt. While Josephus records a few small revolts from the early 1st century, there were three major Jewish revolts against Rome. For the small ones, generally the rebels would be kind of peripheral, and eventually captured and executed.
The first, the Great Jewish Revolt in 70, began with escalating incitement and attacks, until Jewish rebels defeated the Romans in open battle, leading to a long-term conflict. This wasn't really terrorism--just a war, where one side doesn't quite have a stable government they're representing. The result was as you'd probably expect for rebelling against Rome--Jerusalem fell, and many thousands of people were killed, and many more enslaved. But this was more of a regular war than what we'd call terrorism.
The second was the Kitos War, in the early 2nd century. This is closer to what you're describing--Jewish rebels killed large numbers of Roman citizens during the revolt. Eventually the rebel leaders were executed.
The third was the Bar Kokhba revolt, in the 130's. This, again, was more of a revolt (hence the name) than anything we'd call terrorism. The rebels were killed during the rebels' "last stand".