What does 2 Samuel 2:13 mean?

Joab, who was Zeruiah's son, led David's men out and met Abner, who was leading Saul's side, at the pool of Gibeon. They sat down across from each other, one group on one side of the pool and the other group on the opposite side. 2 Samuel 2:13 - Modern Text Bible

(This sets up a tense standoff between David's forces and those loyal to Saul, showing the division in Israel after Saul's death.)