In Honor Among Enemies, Honor "tricks" Andre Warnecke into accepting a deal to escape which she arranges for him to violate:
"I made you an offer which would have left you alive," she told her prisoner. "I would have honored that offer. Thanks to you, I no longer have to." [Chapter 32]
Despite having read the book more than once, I never did figure out... how does Warnecke violate the deal?
If you haven't read the book, it (along with many others set in the Honorverse, including the prequels which you should read first!) is legally available here or here. (If you like Weber's work, please support him and Baen by purchasing books!) The relevant stuff starts at Chapter 31.