In 1862 the war became much more bloody, though neither side was able to gain a lasting strategic advantage over the other. However, the decisive battles of Gettysburg in the east and Vicksburg in the west allowed the momentum of the war to shift in favor of the Union in 1863. Increasingly, Confederate forces were outmatched by the more numerous and better equipped Union forces, whose greater population and economic resources became critical factors as the war became one of attrition. An increasingly effective naval blockade further damaged the Southern war economy.