It is better if you can do the second, use sacrifice whereever you go, and obtain extra leadership from flags or whatever. Even mana potions come in handy when you deplete your mana and next battle is near. Another thing is, buy all available scrolls for sacrifice and use them as scrolls, they dont use up any mana then. For a fast run you don't want to return to any place without a serious reason, so leaving weak troops behind is not a good option.
Also a good advice is to finish battles with full rage, and as much mana as possible.
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