His December 1862 order expelling Jews is known until today but Jeff Jacoby has an interesting look at it:

Notwithstanding its sweeping terms, the order turned out to have little immediate impact on the thousands of Jews living in the area under Grant’s command. Only about 100 Jews were uprooted, primarily in northern Mississippi and in Paducah, Kentucky. Grant’s expulsion order had no discernible effect on the war or on his own military career, either. Lincoln later promoted him to lieutenant general — a rank previously held only by George Washington — and named him commander of all Union armies. Grant became a national hero, and was twice elected president…

More striking by far was the order’s long-term effect on Grant himself. He came to deeply regret what he had done, and went to great lengths to make amends — so much so that the eight years of the Grant administration would prove to be the first golden age for American Jewry. As president, Grant appointed more Jews to public office than any of his predecessors and displayed remarkable sensitivity to the plight of persecuted Jews abroad. At his death in 1885, Grant was fervently mourned in the nation’s synagogues. “Seldom before,” one Jewish newspaper remarked at the time, “has the Kaddish been repeated so universally for a non-Jew as in this case.”