 When Cortés returned to the Gulf coast to deal with the newly arrived hostile expedition of Pánfilo de Narváez, Alvarado remained in Tenochtitlan as commander of the Spanish enclave, with strict orders to make sure that Moctezuma not be permitted to escape.During Cortés' absence, relations between the Spaniards and their hosts went from bad to worse, and Alvarado led a massacre of Aztec nobles and priests observing a religious festival.Alvarado claims he did so because he feared the Aztecs were plotting against him but there is no physical evidence to support this claim and the alleged warnings he received came from tortured captives that very likely would have said anything to make the torture stop.