入侵者正在攻打旅者丘陵和底耶沙高地。把他们打倒，不然就要出现更多难民了！

Objectives

击败个入侵者。

Tiers

1. 1 : 1 objectives completed
2. 1 : 30 objectives completed
3. 1 : 60 objectives completed
4. 1 : 100 objectives completed
5. 1 : 150 objectives completed