From Destinypedia, the Destiny wiki
Peregrine District is a section of The Last City. During the Red War, the Peregrine District was heavily damaged during the fall of the Last City to the Red Legion. The tenth apartment block was destroyed when a Cabal command ship was shot down by the Last City's defenses and crashed into the block, killing many civilians. When the City was retaken by the Guardians, the Young Wolf crashed into this district when their ship was shot down by the Cabal and fought through this district to join the main assault force.
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