All of this activity marked the start of the Vicksburg campaign. At the beginning of the campaign there were about 43,000 men in the Union ranks. In a little over two months General Grant's army will swell to 75,000 men around Vicksbug.
The strength of the Confederate forces at the beginning of the Vicksburg campaign was estimated to be between 40,000 to 60,000 men. By the time Vicksburg surrendered, there was just over 31,000 Confederate soldiers.
