I would imagine it was less of a "training patrol" and more of a 2 day shakedown to ensure that there were no critical issues before sending it into combat. It'

I would imagine it was less of a "training patrol" and more of a 2 day shakedown to ensure that there were no critical issues before sending it into combat. It's the nautical equivalent of a test drive or QA. Consider that the same process usually takes months for a modern warship, even of a proven design.