lieutenant colonel fremantle introduced himself to general longstreet on 27 june, a crucial meeting since it allowed fremantle to observe the advance through maryland and pennsylvania in close quarters to the general and his staff. as well as the other foreign observers, fremantle also became well acquainted with some of longstreet's staff officers, including gilbert moxley sorrel, thomas goree, and the medical staff, doctors cullen and maury. as a neutral observer, fremantle was allowed to enter the town of chambersburg, pennsylvania, which was off-limits to most soldiers and officers on the orders of general lee.