...and retreated quickly indoors. (Para. 7)
retreat: vi. move back, especially when forced; escape
The major decided to retreat because his men did not have enough arms to fight on. 少校決定撤退，因他沒有足夠的武器打下去。
They retreated from the flood to the top of a hill. 他們從洪水中撤退，退到一個小山頂上。
A brave man will not retreat from the real world. 勇敢的人不逃避現(xiàn)實。
indoors: ad. inside a building
Please take care that "indoor" is an adjective.
We play many sports indoors, but baseball is not an indoor sport. 許多運動項目是在室內(nèi)進行的，但壘球不是一項室內(nèi)運動。
They carried the benches indoors as it was raining outside. 外面下雨了，他們把凳子搬進屋里。