Pro-government forces are attacking rebel positions in the eastern part of Libya, stalling what opponents of Moammar Gadhafi’s regime had hoped would be a steady march to the capital Tripoli. Military troops loyal to Gadhafi launched new attacks against rebel forces in the coastal town of Ras Lanuf on Monday after attacking them with tanks, helicopters and fighter planes the previous day in Bin Jawwad. “We’re trying,” said an army second lieutenant now fighting with the rebels. “We’re not advancing. We can’t do anything about it.” But he and other fighters said they would regroup and return to Bin Jawwad.