150 years ago today a few select individuals had the responsibility of feeding, clothing and equipping the two largest armies in the Western Hemisphere.  Joseph Johnston's Confederate army and George McClellan's Union army required massive behind-the-scenes efforts to sustain them.  While little visual documentation of the Confederate logistical operation survive, the Union supply hubs were well photographed.  Over the next few days we will examine this photographic record to pay tribute and bring to light the many unknown soldiers captured in those images 150 years ago.  Check back tomorrow for our first installment.