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 Chic

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 (https://en.wikipedia.org/wiki/Port_Chicago_disaster https://en.wikipedia.org/wiki/Port_Chicago_disaster). It was during wartime, and a lot of people died, but it really wasn't a battle. It was an accident that involved a lot of munitions. The only opponent in that "battle" was unsafe working conditions. They don't have the explosion of the munitions ship in Halifax in 1916 listed as a battle, which was a very similar situation, so I'd say there are some issues with the source data. It's a very interesting map though. They have a lot of stuff on there.