YOU SAID:

So they went down and they sat on the pier

INTO JAPANESE

彼らは下りて桟橋に座った

BACK INTO ENGLISH

They went down and sat on the pier

INTO JAPANESE

彼らは降りて桟橋に座った

BACK INTO ENGLISH

They got off and sat on the pier

INTO JAPANESE

彼らは降りて桟橋に座った

BACK INTO ENGLISH

They got off and sat on the pier