Task: Explanation
Input (English): During World War II, Operation Grenade was the crossing of the Roer (Rur) river between Roermond and Düren by the U.S. Ninth Army, commanded by Lieutenant General William Hood Simpson, in February 1945. Question: Which happened first, Battle of Cold Harbor or Operation Grenade? Answer: Battle of Cold Harbor
Output (English): During World War II, Operation Grenade was the crossing of the Roer Rur river between Roermond and Düren by the U.S. Ninth Army, commanded by Lieutenant General William Hood Simpson, in February 1945.