feriatque magno opere ut essent, edixit

feriatique magno opere ut essent, edixit: and they having a great holiday, he decreed. Thus - translated to and he (Priamus) decreed so that they (the Trojans) were keeping (having) a great holiday. Once the Trojan Horse was brought into the city and taken to the citadel of Minerva, the Trojans believed that the Greeks were offering a truce, and therefore were rejoicing as if it were a holiday.