RED Line vs BLUE Line
The term "thin blue line" is said to be derived from the "thin red line," and this dates all the way back to 1854. The thin red line was a battle formation assumed by the 93rd Highland Regiment of the British Army against the Russian cavalry at the Battle of Balaclava.
Fast forward 57 years and the thin red line came to America…at least in poetry. Nels Dickmann Anderson wrote "The Thin Blue Line" in 1911, tweaking the color to blue, but he didn't associate it with police officers. It referred to U.S. Army in the poem. They wore blue uniforms at that time.
The BLUE Line was crossed (again) with the murder of the Borderline shooting responding Deputy