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In OTL BB's did pretty good for bombardment and the American ones bristled with AA of 20mm, 40mm and 5-Inch Calibers and performed admirably in an Anti-Aircraft Role. And the later ones were very fast an Iowa's top speed was a good 2-3 knots faster than a modern Arleigh Burke Class Destroyer for example.
So my question is this:
What if BB's are armed with Depth Charges and Torpedo launchers as well and the Hull is the most armored part of the Battleship?