The Southern economy nearly collapsed during the war due to multiple factors, the most notable being severe food shortages, failing railroads, loss of control over key rivers, foraging by Northern armies, and the seizure of animals and crops by Confederate forces. Historians agree the blockade was a major factor in ruining the Confederate economy; however, Wise argues blockade runners provided enough of a lifeline to allow Robert E. Lee, a Confederate general, to continue fighting for additional months, as a result of supplies that included 400,000 rifles, lead, blankets, and boots that Confederate economy could no longer supply.