Share This Article 1. The counterweight trebuchet arrived in England when Prince Louis of France besieged this castle in 1216. Windsor Castle Carlisle Castle Hetford Castle Dover Castle 2. In 536 AD, this man reconquered the city of Rome for the Byzantine Empire. Ambrosius Aurelianus Flavius Stilicho Flavius Belisarius Desiderius 3. The last American ground-combat unit left Vietnam in this year. 1973 1970 1972 1975 Loading …