The last time, the engine was cranking with a starter battery hooked up – right up to when the battery terminal melted and the negative lead detached.
Consequently this time I expected to hook up a new battery, bleed the engine to the injectors and most likely have it running fairly easily after that.
So I installed the new battery:

I hooked up my water supply to stop the raw water pump impeller from burning out:

I cracked an injector and primed the diesel system until diesel came out of it (which I wasn’t sure I’d be able to do without the engine turning, as that’s on the high pressure side, but it seemed to work fine).
Finally, I went to the helm and turned the ignition key for the moment of truth…
… and nothing happened.
Most likely I damaged something else last time I tried, but I didn’t bring either the tools or the time on this trip to do anything more with the engine this time.
Retreat, re-plan and revisit…