Talk:Defensive Buildings/@comment-26997397-20150918142254/@comment-25856498-20150918152817

Yes they will, at the level they are being upgraded from.

Example: I upgrade a level 9 Cannon to level 10 during preparation day, it's gonna be a level 9 Cannon during battle day.

One exception: buildings that are undergoing construction can be placed on the war base, as a level 1 building that is fully functional.