“the servants of Ish-bosheth,” In this context, “servants” refers to men in the army.

“went out.” In this context, this phrase has a military connotation, such as “went out to battle.”

“to Gibeon.” Gibeon was in the tribal area of Saul, and it seems that in going to Gibeon, Abner wanted to shore up the southern border of the tribes that might well follow him and Ish-bosheth instead of David.