I thought to use the same menu as for upgrading city
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Now it works only one way, probably it might be used both ways, to upgrade and downgrade.
If city level is 7, but opponent have siege +10 and can probably win, it would be interesting to keep the city to join it's defenders all together (may be 12-16 defenders), but to downgrade city level to 1, using this menu and paying price shown in it.