Various barbarian tribes went from raiding and pillaging the island to invading and settling. The series depicts The Hive as an alien species who are covertly invading Earth. Homes were requisitioned to house invading German forces. The total number of invading troops eventually reached 500,000. Davao City was among the earliest to be occupied by the invading Japanese forces. He hears the rumble of the Manchu invading forces. Timur retaliated by invading Khwarezm and destroyed Urgench. It was used alongside the panokseon warships in the fight against invading Japanese naval ships. Conditions improved in late 2002, when a large portion of the invading foreign troops withdrew. They demanded to be released to fight against the invading Germans. Austrian troops began to concentrate in Bosnia as a preparatory step towards invading Serbia. Eadred responded by invading and ravaging Northumbria. Sennacherib soon responded by invading and ravaging Elam. Mechnikov proposed that phagocytes were a primary defense against invading organisms. The Romans may have been part of Antony's army invading Parthia.