Fighters of a local militia opposed to Myanmar’s junta have pulled back from the northwestern town of Mindat after days of assault by combat troops backed by artillery, a member of the group said on Sunday. The United States and Britain called on the army to avoid civilian casualties and a shadow National Unity Government formed by loyalists of Myanmar’s detained elected leader, Aung San Suu Kyi, appealed for international help. A spokesman for the junta did not answer calls for comment. The fighting in the hill town of Mindat, about 100 km (60 miles) from the Indian border in Chin state, is some of the heaviest since the coup plunged Myanmar into chaos with daily protests, strikes and the emergence of new local militias. “To avoid confrontation, we retreated out of concern over damage to ...