Plan of the Alamo, by José Juan Sánchez-Navarro, 1836. José Sánchez-Navarro Papers, The Center for American History, The University of Texas at Austin; CN 01579a. This manuscript map, part of an official military report on the fall of the Alamo, clearly shows where the Mexicans had positioned their cannons (at R and V) and the line of attack of troops under General Cos (S).