2). Coordinated land and naval operations: Grant coordinated his land forces with the Union navy, led by Admiral David Farragut. The navy successfully ran past Confederate batteries on the Mississippi River, giving the Union control of the river and cutting off Vicksburg's supply lines.
3). Siege tactics and entrenchments: Grant employed siege warfare techniques, slowly encircling Vicksburg and digging trenches closer to the city. This strategy allowed the Union forces to gradually weaken the Confederate defenses and limit their maneuverability.
4). Lack of Confederate reinforcements: Unlike previous attempts to capture Vicksburg, Confederate General Joseph E. Johnston's efforts to reinforce the city were delayed and ultimately unsuccessful due to Union forces engaging him at the Battle of Champion Hill.
5). Starvation and surrender: The siege tactics led to a shortage of food and supplies within Vicksburg. Facing starvation, the Confederate commander, General John C. Pemberton, finally surrendered the city on July 4, 1863.
6). Union's superior manpower and resources: The Union army had a significant numerical advantage over the Confederates, both in terms of soldiers and artillery. This allowed Grant to maintain pressure on the city and withstand Confederate counterattacks.
7). Low morale among Confederate troops: The prolonged siege, dwindling supplies, and constant bombardment demoralized the Confederate troops, making them less effective in defending the city.
In conclusion, the successful siege of Vicksburg was a result of a combination of Grant's determination, coordinated military operations, effective siege tactics, and the overwhelming strength and resources of the Union army.