Volunteers take part Wednesday in a weapons-training session given by Libyan government soldiers at a military camp in Tarhouna. TRIPOLI—On a recent morning dozens of trucks filled with bulk food products coming via neighboring Tunisia were offloaded at the country's largest wholesale market outside the Libyan capital here. The goods, including bags of flour and rice, filled warehouses as well as trucks headed to other centers sympathetic to Col. Moammar Gadhafi such as Sebha in the south. Most food supplies used to arrive by sea at the ports of Tripoli and Misrata, Libya's commercial hub farther east. Imports have been...