[Non-Sequitur]

Only two double turreted Monitors served in the war, one being the U.S.S. Onondaga.

Are you sure on that? I've seen pictures of 4:

Puritan

Monadnock

Onandoga

and Miantonomah

[Shooter 2.5]

I didn't write from memory. I was writing bits and pieces from the book series, The Images of War 1861-1865, The Embattled Confederacy, Volume III, Page 150

The book series has some great pictures I had never seen before.