Since This Is A Day That WIll Live In Infamy

Star-Telegram article on "The Lost Battalion"

The 558 men of the 2nd Battalion, 131st Field Artillery, a National Guard outfit with men from Decatur, Bridgeport, Jacksboro, Wichita Falls and neighboring towns, didn’t know anything else about the sneak attack [on Pearl Harbor] and wouldn’t for weeks.

Oddly, there's no Wikipedia article on that group of men but it does refer to others by that name.