If a smithy is destroyed do all troops go back to base level or just the ones that are built after destruction.

destroying smithys
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If a smithy is destroyed do all troops go back to base level or just the ones that are built after destruction.
Everything that is reasearched stays so. Like units that get researched in academy stays so even if you destroy academy.
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does new production stay at old smithy level
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does new production stay at old smithy level
As Koma23#EN said, everything that you do in a Smithy before you demolish wills the the same. If you upgrade all of your units to level 20 and destroy your smithy, they will stay level 20.
The only way to make those smithy levels disappear is if someone chiefs that village OR someone completely destroys that village. -
the only problem with the demolition of the academy and the blacksmith ...
you build in the empty areas, there is no empty area left
if your enemy destroys the barracks, stables, or workshop
then you will be in trouble. without the academy and the blacksmith you can't rebuild them.
keep that in mind!