My grandfather was born in America to a Polish immigrant family, and on September 1st, 1939 joined the US Army. I guess he felt it was all he could do at the time to help his family's native country.
He was stationed on Iceland for awhile, then fought in North Africa, Sicily and eventualy France and into Germany with the US 5th infantry division, part of Patton's 3rd Army.
He also told me once about a camp they liberated, and I hope I get this right, called Buchenwald. He only spoke about it once, and he said it was the worst part of the whole war for him.
I know the Soviet occupation of Poland after the war was another cruelty to him, but in his words "Theres no limit to the things some people will do to others". He was speaking of the Nazi exterminations.
It makes me feel good to know there were, and still are people like the Schindlers in this world.