1- I order the four US 105mm's to bombard the circled hex because I placed a German infantry unit in there in the editor.
2- The arty begins plastering the hex.
3- I send in a C-47 to spot the unit and we see that the units strength number '10' has turned a sickly yellow indicating loss of efficiency.
But wait, there's even better news!- the UI indicates that the units strength has been reduce to '4', even though its strength plate still reads '10'.
4- Gabe pointed out that the strength plate takes a turn to update, and bingo, we see that a turn later it's updated to strength '4'..

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Below: HOWEVER, for the record blind bombardments have no effect on ships or subs, their strength and efficiency stay at maximum even on the next turn.
Jap destroyer-

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Below: Bombardments also have no effect on this jap sub, surfaced or submerged-


