What effect did the Union victory at Vicksburg have on the Confederate garrison at Port Hudson?%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0AThey called for reinforcements.%0D%0AThey called for reinforcements.%0D%0A%0D%0AThey surrendered.%0D%0AThey surrendered.%0D%0A%0D%0AThey switched sides.%0D%0AThey switched sides.%0D%0A%0D%0AThey dug in for a siege.