The Confederacy had no plan to expand, protect or encourage its railroads. Southerners' refusal to export the cotton crop in 1861 left railroads bereft of their main source of income. Many lines had to lay off employees; many critical skilled technicians and engineers were permanently lost to military service. In the early years of the war the Confederate government had a hands-off approach to the railroads. Only in mid-1863 did the Confederate government initiate a national policy, and it was confined solely to aiding the war effort. Railroads came under the "de facto" control of the military. In contrast, the U.S. Congress had authorized military administration of Union-controlled railroad and telegraph systems in January 1862, imposed a standard gauge, and built railroads into the South using that gauge. Confederate armies successfully reoccupying territory could not be resupplied directly by rail as they advanced. The C.S. Congress formally authorized military administration of railroads in February 1865.