The flag of the United States during the first half of the civil war, the 34 Star version of the Stars and Stripes was flown by the Armies of the North throughout the conflict.  Like all versions of the flag after 1818, it bore 13 red and white stripes for each of the original Colonies, and a star for each state, even those that were attempting secession.  It remained the official flag of the United States until West Virginia separated itself to rejoin the Union in 1863.