EXCLUSIVE: ABC News Caught in Firefight as Afghan Forces Get Tested on Battlefield Muhammad Lila Reports Exclusively Tonight on "World News With Diane Sawyer" and "Nightline" ABC News correspondent Muhammad Lila had a firsthand look at the future of fighting in Afghanistan when the unit he was covering came under fire from the Taliban today. For the past week, Muhammad Lila and producer Matt McGarry have been embedded with U.S. and Afghan troops in the provinces of Nuristan and Nangarhar, a mountainous region that straddles the Afghan-Pakistan border - an area where fighting is expected to be heaviest this summer. As the U.S. mission enters a crucial phase where Afghan forces begin to take the lead on the battlefield, small advisory teams are replacing large army units. Today the ABC team witnessed a key test case - with Afghan forces coping with a Taliban ambush; and the U.S. playing a key but supporting role. The episode raises an essential question: Are Afghan forces capable of leading the fight for their country's future? Muhammad Lila's exclusive report from the battlefield airs tonight, Thursday, July 5 on "ABC World News With Diane Sawyer" and "Nightline," America's #1 show in late-night. "ABC World News with Diane Sawyer" airs at 6:30 p.m. ET on the ABC Television Network. "Nightline" airs at 11:35 p.m. Jeanmarie Condon is the executive producer of the broadcast. ABCNEWS.COM: "Taliban Ambush Witnessed by ABC News Tests Afghan Army" by Muhammad Lila in Nuristan, Afghanistan - http://abcn.ws/MC2SyU WATCH: ABC News cameras were rolling as Afghan forces returned fire against Taliban fighters - SHOWS: Nightline World News