The verse "Israel set ambushes all around Gibeah" (Judges 20:29) means that the Israelite army, in their war against the Benjamites who were defending the wicked city of Gibeah, strategically positioned hidden troops around the city. These "ambushes" were concealed groups of soldiers waiting to attack the Benjamites from unexpected directions, likely once the main Israelite force had drawn the Benjamites out of the city.

Here's a breakdown of what that implies:

Israel: Refers to the combined forces of the tribes of Israel, excluding Benjamin in this context.
Set ambushes: This means they deployed troops in hidden positions, prepared to launch a surprise attack.
All around Gibeah: Indicates that these ambushes were strategically placed around the perimeter of the city. This was likely done to cut off escape routes, surround the Benjamites, and create chaos.

The purpose of these ambushes was likely multifaceted:

To trap the Benjamites: Lure them out of Gibeah and into a trap.
To cut off reinforcements: Prevent any outside help from reaching the Benjamites.
To demoralize the enemy: Create confusion and fear among the Benjamites by attacking from unexpected angles.
To ensure a decisive victory: Increase the likelihood of defeating the Benjamites and punishing the city of Gibeah for their heinous crime.

In essence, this verse describes a military tactic designed to outmaneuver and overwhelm the enemy through strategic placement of hidden forces. It signifies a planned and coordinated attack, rather than a simple frontal assault. This tactic was common in ancient warfare.