One of the units MacArthur had available to him was the 6th Ranger Battalion. Because of their training, they were qualified to operate behind enemy lines. They were commanded by Lieutenant colonel Henry Mucci. In mid-October 1944 they landed ahead of the main American forces to destroy enemy positions and radio stations guarding the entrance to Leyte Gulf. When the 6th Army landed at Luzon, the 6th Ranger Battalion was with them. As the 6th Army moved into central Luzon, General Walter Krueger, commander of the 6th Army, learned about the camp from American officers who had remained in Luzon with the Filipino guerrillas.