I noticed that there was a battle from the 20th century in the eastern Bay Area, and was confused about what it could be. It turns out that it was the Port Chicago disaster (<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Port_Chicago_disaster" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Port_Chicago_disaster</a>).<p>It was during wartime, and a lot of people died, but it really wasn&#x27;t a battle. It was an accident that involved a lot of munitions. The only opponent in that &quot;battle&quot; was unsafe working conditions.<p>They don&#x27;t have the explosion of the munitions ship in Halifax in 1916 listed as a battle, which was a very similar situation, so I&#x27;d say there are some issues with the source data.<p>It&#x27;s a very interesting map though. They have a lot of stuff on there.