to break the terms by...

[Reemani]

Hey,
Our teacher gave us a hand out about one of the historical characters, and in the passage, I read this sentence "He broke his terms by razing a town" and i'm wondering if this is an idiom? and what does it mean?

[Tdol]

To raze = burn something down

'The temrs' must refer to some agreement that he broke by burning the town to the ground.