By Lee's estimation, the fort could not be reduced by bombardment or direct assault, only by starvation. As long as supplies could be built up, they would be. The last Confederate supply ship to Fort Pulaski was the small workhorse steamboat "Ida". On February 13, it was on a routine run to the fort down the North Channel. The new battery of Federal heavy guns on the north bank opened up for the first time. The old side-wheeler ran for Pulaski and the battery got off nine shots before the guns recoiled off their platforms. Union troops went back to work modifying platform construction and resetting the cannon. Two days later "Ida" ran up the South Channel under the extinguished lighthouse and returned to Savannah through Tybee Creek.