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Port Hudson
The largest surrender was Lee surrendering the Army of Northern Virginia to U.S. Grant at Appomattox Court House (April 9th 1865). It was not the last surrender. Joseph E. Johnston surrendered his army to Sherman later the same month, and the final surrender was at Palmito Ranch, Texas in May. PS. Checking the troop-numbers, I find that Lee surrendered only 28,000 men. In July 1863, Grant had captured 30,000 men after the siege of Vicksburg. So it could be that Vicksburg represented the biggest surrender.
The Battle of Vicksburg is also called the Siege of Vicksburg
Vicksburg was a Confederate stronghold on the Mississippi River
Vicksburg was to valuable as a river port to destroy.
Port Hudson
Ulysses S. Grant won the battle at Vicksburg making Lee surrender
The surrender of Vicksburg closed the Mississippi to southern traffic, making the transportation of troops and supplies impossible.
Grant forced Pemberton's surrender after a month-long siege.
Vicksburg surrendered on July 4th, 1863.
Grant accepted Pemberton's surrender to end the Siege of Vicksburg.
The Battle of Vicksburg was the last major action of the Vicksburg Campaign of the American Civil War. Grant's Union forces drove the Confederate forces into a defense of the city of Vicksburg, Mississippi. Two major assaults were held off, but the third siege, lasting 10 days, resulted in the Confederate's surrender. This action is considered to be one of the major turning points of the American Civil War.
1863 For more information see 'Related Links' below
There is a misconception regarding the importance of the fall of Vicksburg after a Federal siege. The logistics and military situation was not altered by Vicksburg's surrender. The Confederate high command had charged off Vicksburg in 1862. The loss of the city fortress and control of the Mississippi River did not add to the military situation for the Union. One thing that historians do agree on was that is was a Union propaganda victory. Some historians wrongfully believe that the fall of Vicksburg was a truning point in the war.
Vicksburg.
It was the battle of Vicksburg.
When Union General US grant was the victor in a number of battles prior to the siege of Vicksburg, he was known for his policy of "unconditional surrender. This was not the case in the siege and fall of Vicksburg.After consulting with his generals on the two choices they had, which was to try to battle their way out of Vicksburg or surrender, the consensus was to surrender. After that decision they asked General Grant for terms of surrender. With that said, Grant realized that Vicksburg had almost 30,000 troops in the city. Dealing with all of these prisoners would have slowed down Grant's future plans to a maximum level. Grant then followed the then accepted practice of paroling the Rebel soldiers.