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