The defending army is on the run. In a desperate attempt to help the troops escape, a rear guard is assembled, hoping beyond hope to delay the rapidly advancing attacking troops. They will run out of ammunition of course, or be overwhelmed.
This was the image that came to mind when I heard Alistair Davis at the Metals Bulletin 8th World congress last week, describing the latest ALABC programme to improve dynamic charge acceptance in lead-acid systems. It's the weakest link, the achilles heel, the runt of the litter in arguments after you . . .