The Battle of El Bramadero, or the Battle of Bromaderos, took place between the 27 and 28 February 1928 during the American occupation of Nicaragua of 1926–1933 and the Sandino Rebellion. The battle began on the twenty-seventh when a convoy of thirty-six Marines, one American naval pharmacist's mate, twenty Nicaraguan "muleros," two Nicaraguan "'Jefe' muleros," and 99 mules led by First Lieutenant Edward F. O'Day moving along the Yalí–Condega trail was ambushed by a force of Sandinista rebels led by Miguel Angel Ortez.