OET interlinear 2 SAM 20:15

uW Translation Notes:

Note 1 topic: figures-of-speech / pronouns

וַ⁠יָּבֹ֜אוּ

(Some words not found in UHB: and=they_came and,they_laid_siege on/upon/above=him/it in,,of house_of maˊₐkāh and,they_poured_out siege_ramp to/towards the=city and,it_stood by,rampart and=all the,people which/who DOM Yōʼāⱱ/(Joab) battering to,make_fall the,wall )

The pronoun they refers to Joab and his soldiers. If it would be clearer in your language, you could state this explicitly. Alternate translation: [And Joab and his soldiers came]

Note 2 topic: translate-unknown

בַּ⁠חֵ֑ל

(Some words not found in UHB: and=they_came and,they_laid_siege on/upon/above=him/it in,,of house_of maˊₐkāh and,they_poured_out siege_ramp to/towards the=city and,it_stood by,rampart and=all the,people which/who DOM Yōʼāⱱ/(Joab) battering to,make_fall the,wall )

A rampart is a kind of defensive wall or fortification around a city, specifically in this context an outer wall of a city that also has an inner wall. If your readers would not be familiar with what a rampart is, you could use the name of a similar thing that your readers would recognize, or you could use a more general term. Alternate translation: [against the outer wall]