That's right
About half of the 11th corps consisted of immigrants among whom the Germans were by far the largest group (altogether more than 200 000 Germans fought in the American Civil War while the Irish (who usually get much more attention) were the second largest foreign born group with about 150 000). The famous flank attack of Stonewall Jackson in the battle of Chancellorsville hit the 11th corps first and in spite of many many warnings (ranging from Federal cavalry detecting Jackson's flanking march to large groups of deer rushing out of the forest before the confederates announcing their approach) the outflanked corps was no match for the attack though it was not routed completely and immediately as was later claimed in order to make the "damned Dutchmen" the scapegoat for the defeat. It wasn't helping the reputation of the Germans that two month later at Gettysburg they found themselves outnumbered, outflanked, and routed once again.
On average the German soldiers in the Union army fought about as good or bad as native born soldiers, but it cannot be denied that the Germans provided the Union with a dreadfully incompetent political general, Franz Siegel, who was adored by the Germans in spite of his utter incompetence.
While many Germans had hoped for their service in the Civil War to lessen the hostility promoted by nativist groups (e.g. the "Know Nothing Party" in the years preceding the war) the aftermath of the battle of Chancellorsville contributed to a deepening of the rift. Because many Germans assimilated more smoothly into the American society than some other immigrant groups they don't tend to get as much attention by the historians.
Anyway, your turn noname.