Schwammenauel is secured after the outlet works are wrecked
U.S. troops secured the Schwammenauel dam on 10 February and found the dam structure standing with its discharge valves and outlet controls destroyed by German engineers. The damage released water steadily downstream, producing a prolonged flood across the Roer valley. Operation Grenade had been scheduled to begin that morning. The flooded Roer spread across the low ground and reached widths and currents that made assault bridging impracticable, so Ninth Army postponed the crossing while engineers watched the water level fall.
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