From: Los Angeles
I've always thought of the "74's" as the standard ship of the line in the age of wood and sail. Apparently, the Invincible was the first 74 in the Royal Navy, and the heyday only lasted until the end of the Napoleonic wars, or about 70 years.
Incidentally, the name "invincible" seems to have been tempting fate. Of the six HMS Invincibles, only two survived to be retired. The rest were sunk in accidents, storms, or (most famously) blown in two at Jutland.
Civil war? What does that mean? Is there any foreign war? Isn't every war fought between men, between brothers?