Original sentence: However Giáp, seeing the weakness of the French position, started moving most of his forces from the De Lattre line to Ðiện Biên Phủ.Operation Castor was launched on November 20 1953 with 1,800 men of the French 1st and 2nd Airborne Battalions dropping into the valley of Ðiện Biên Phủ and sweeping aside the local Việt Minh garrison.The operation was a tactical success for the French.The paratroopers managed control of a heart-shaped valley 12 miles long and eight miles wide surrounded by heavily wooded hills
Edited sentence: "Operation Castor" was launched on November 20 1953 with 1,800 men of the French 1st and 2nd Airborne Battalions dropping into the valley of Ðiện Biên Phủ and sweeping aside the small, local Việt Minh garrison.But Giáp, seeing the weakness of the French position, started moving most of his forces from the De Lattre line to Ðiện Biên Phủ.The operation seemed a success for the French.The paratroopers found themselves in control of a heart-shaped valley 12 miles long and eight miles wide surrounded by heavily wooded hills