Giap had lost several family members to the rigors of French colonial rule, including his wife who was arrested and died in a French prison. A model of cool, methodical persistence, Giap was not goaded or tricked into a rash counterattack on Dien Bien Phu. He patiently assembled his forces, digging gun positions in the forested slopes overlooking the French defenses and amassing a huge supply of ammunition carried by thousands of porters through the jungle. Then on March 13, 1954, Giap struck at Dien Bien Phu, capturing several key strong-points and pounding the air strip so that supply planes could no longer land. The base aero-terrestre had become a death trap.