Everything else Asa did while he was king, including his victories and the towns he rebuilt, is written in The History of the Kings of Judah. When he got older, he had a foot disease.
Then he chose three thousand men from Israel to be full-time soldiers and sent everyone else home. Two thousand of these troops stayed with him in the hills around Michmash and Bethel. The other thousand were stationed with Jonathan at Gibeah in the territory of Benjamin.
Jonathan decided to get to the Philistine camp by going through the pass that led between Shiny Cliff and Michmash to the north and Thorn Bush Cliff and Geba to the south.