In A new latin composition by Charles E. Bennett one may find following statement to translate into latin (from Lesson IV):
This circumstance made the troops more courageous.
My attempt at translation is:
Res haec milites fortioribus egit.
I used fortior in ablative, however I don't know whether it is correct.
This leads to the more general question: what should be the case of the adjective Z in "X made Y (more) Z" construction?