طائرة استطلاع
Army intelligence concerning the presence of Viet Cong in Sơn Mỹ was inaccurate, however, and the village's population was predominately composed of neutral, unarmed rice-farming families. Reconnaissance aircraft, including Thompson's OH-23 crew, flew over the Sơn Mỹ vicinity but received no enemy fire. At 07:24, without validating intelligence reports, the United States Army shelled Sơn Mỹ, killing many Vietnamese civilians. Following the shelling, Company C (Charlie Company), 1st Battalion, 20th Infantry Regiment of Task Force Barker, led by Captain Ernest Medina, moved into Sơn Mỹ.