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As Commander in Chief, President Abraham Lincoln responded to the Confederate attack on Fort Sumter by calling for 75,000 militia volunteers. Their first duty was to repossess federal property seized from the Union by the seven seceded states. Lincoln also used his constitutional authority to convene an extraordinary session of Congress for July 4, 1861.
Records of the U.S. Senate, National Archives and Records Administration
Deeming that the present condition of public affairs presents an extraordinary occasion, I do hereby, in virtue of the power in me vested by the Constitution, convene both Houses of Congress.