In the public domain translation of Samuel Taylor Coleridge. I have the Penguin modern translation, but give me Coleridge:

The emperor hath urged me to the uttermost.
I can no longer honorably serve him.
For my security, in self-defence,
I take this hard step, which my conscience blames.
-- STC

The Emperor has driven me to take
The fatal step. I can no longer be his servant.
In self-defence, I must for my own safety
Do what my conscience cannot but condemn.
-- the Penguin

I happen to be thinking about defectors at the moment, quite elsewhere in history, and by accident came to this -- called Schiller's masterpiece, that I've always meant to read -- the tragedy of a defector in the Thirty Years' War.

The love story on the side pulled the play down. In short, five stars for Wallenstein's scenes.