They call it “das Amerikanisches Buergerkrieg”.
German gun magazines have always been huge about American military history. Heck, when I was a kid in the 1960’s, Germans were already dressing up like Indians and U.S. Cavalry.
Safer than dressing up like Waffen SS. (Sorry, couldn’t resist) But there’s a side of the German character that likes to remind America of its own Teutonic roots, which is undeniable and dates back to the Revolutionary War.
I’ll bet these modern German reenactors have already constructed ancestral geneologies of German immigrants who fought in the American Civil War.
Most of those fought for the Union. In fact quite a number of Germans living in Texas supported the Union. Hardly any of the German immigrants to Texas became slave owners. At the beginning of the Civil War, there was a group of Germans in the town of Comfort (a German town about 100 miles northwest of San Antonio) who attempted to cross the Rio Grande into Mexico so they could then travel to the North and volunteer in the Union army. Confederates intercepted them on the west bank of the Nueces River where 61 were killed in the Battle of the Nueces, and the 9 wounded survivors were all executed later that day.