This week marks the 150th anniversary of Robert E. Lee’s surrender at Appomattox. After the fall of Petersburg, Virginia, on April 2, 1865, and Richmond on April 3, Lee’s Army of Northern Virginia tried to move west to merge with Joseph E. Johnston’s Army of Tennessee, but was blocked by Grant’s forces. Realizing the full strength in numbers of the Union troops his army faced, Lee began negotiating peace terms on April 7. (Here’s a link to the correspondence between Lee and Grant between April 7 and April 9, when they met in person to formalize Lee’s surrender.)