I am pretty sure I already know the answer but when the infirmaries are full and more of your troops are wounded do they die off? If so I probably am just going to keep the size of my army at a small positive food upkeep. I am running 7 accounts and I usually rushed through them. I am too lazy to be careful. I would hate to get zeroed and lose months of progress.
It''s hard for me, personally, to imagine running 7 accounts. I would think most would be farms? If not, I wouldn't think you could run any of them efficiently.
But if you have more troops than your infirmary and shelter can handle, you should definitely send them on 8 hr 'ghost rallies' to make sure they can''t be killed or wounded while your away.