In November Durruti was called to collaborate in the defense of Madrid, but he was not allowed to take more than a part of the column (about 1,400 out of more than 6,000 militiamen that the column had at the time). This section of the column was decimated in Madrid, in the Battle of Ciudad Universitaria, and Durruti died there from a point-blank shot of unknown origin on November 20. He was replaced at the head of the " Durruti Column " in Madrid by Ricardo Sanz. In Aragon, the column was commanded by José Manzana who ended up accepting its militarization, thus becoming the 26th Division. Ricardo Sanz took command of the entire column in April 1937. Together they fought in the Battle of Belchite and in the defense of Catalonia in January 1939.