Premise:
"Their occupation was fiercely opposed by a confederation of Celts, known as the Lusitani, living in central Portugal."
Hypothesis: The Celts in Portugal were called the Lusitani.

yes

Premise:
"Katz's war is won, but declaring victory and resting his vocal chords would mean giving up his career as the Jeremiah of cyberspace and finding a new hustle."
Hypothesis: Katz won the war by a narrow margin.

it is not possible to tell

Premise:
"We have to deal with a most clever and unscrupulous man, and we must use any means in our power "otherwise he will slip through our fingers. "
Hypothesis: We are dealing with a criminal mastermind, and we must be cautious.
it is not possible to tell