The funny thing is that I always have >75% battery power, and plenty fuel to do anything I want. Maybe I'm just more efficient at my energy usage, and thus use different tactics.
I also don't think you'll find anything in contravention to the orders, on paper.
If I was a sub skipper in WW2, I'd still use the same method, but lie in my patrol log to make it look like I was following orders. I'd would entrust this info only to few fellow skippers, as their lives and the crew are more important.