мы отправились

we set off

→ мы
phrase Rare #39,727
we set off Past-tense form meaning that a group including the speaker left or departed for somewhere or went to do something. Often translated as “we went” in natural English.
RU: Утром мы отправились в музей.
EN: In the morning, we set off for the museum.

Инок дуется с тех пор, как мы отправились за Джейком.

Inok has been sulking ever since we went after Jake.

— Дом странных детей Мисс Перегрин (2016)