[sector24]

I asked the same question awhile back and this was the answer I found most useful:
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10% extra tax creates approx. 3 unrest.

3 soldiers will approx. remove 1 unrest.

Those figures are only a rough guide but I find useful in maximising my tax income.

-Meglobob
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Obviously things change when you have patrol units, or flying units like Harpies.