 Complete the following phrase:  In March 1863, the regiment was transferred to Grand Gulf, Mississippi, where the regiment built fortifications. The next month, the regiment was part of an observation force sent across the Mississippi River into Louisiana. After returning from Louisiana, the regiment was stationed at Grand Gulf, and did not participate in the Battle of Port Gibson on May 1. On May 3, the regiment was part of a rear guard that protected the Confederate retreat from Grand Gulf. At the 