<P> The loss of Vicksburg split the Confederacy in two, denying it any further movement along or across the Mississippi River and preventing supplies from Texas and Arkansas that might sustain the war effort from passing east . As President Lincoln had stated, "See what a lot of land these fellows hold, of which Vicksburg is the key! The war can never be brought to a close until that key is in our pocket...We can take all the northern ports of the Confederacy and they can defy us from Vicksburg ." Furthermore, the 30,000 soldiers who surrendered with the city were a significant loss to the military manpower of the Southern cause . </P> <P> Gettysburg was the first major defeat suffered by Lee . The three - day battle witnessed the Union Army of the Potomac decisively repel his second invasion of the North and inflicted serious casualties on his Army of Northern Virginia . In fact, the National Park Service marks the point at which Pickett's Charge collapsed, a copse of trees on Cemetery Ridge, as the high - water mark of the Confederacy--the northernmost point reached by any major Confederate military incursion . From this point onward, Lee attempted no more strategic offensives . Although two more years of fighting and a new, more aggressive general - in - chief (Grant) was required to fully subdue the rebellion, the eventual end at Appomattox Court House in 1865 seems inevitable in hindsight . While Gettysburg was seen by military and civilian observers at the time as a great battle, those in the North had little idea that two more bloody years would be required to finish the war . Lincoln was distraught at Meade's failure to intercept Lee's retreat, believing that to have done so would have ended the conflict . </P> <P> Southern morale was seriously affected by the twin setbacks of Gettysburg and Vicksburg, as they perceived that "the coil was tightening around us". Some economic historians have pointed to the fact that after the defeats at Gettysburg and Vicksburg, the market for Confederate war bonds dropped precipitously . "...European investors gave the Confederacy approximately a 42 percent chance of victory prior to the battle of Gettysburg / Vicksburg . News of the severity of the two rebel defeats led to a sell - off in Confederate bonds . By the end of 1863, the probability of a Southern victory fell to about 15 percent ." </P> <P> Military historian J.F.C. Fuller contended that Grant's defeat of Braxton Bragg's army at Chattanooga, Tennessee was the turning point of the war because it reduced the Confederacy to the Atlantic coast and opened the way for William T. Sherman's Atlanta Campaign and March to the Sea . </P>

Which two battles in the summer of 1863 were most significant to the north’s eventual victory