Outnumbered with the ratio of 20:1, Sultan Kudarat Mopak on a white horse decided to do battle with his men notwithstanding the odds.

This intrepid, although suicidal show of force and determination, so impressed by Utto, that in order to save lives on both sides, he decided to resolve the issue by negotiation, thus placing Kudarat and his principality under his protectorate of Utto, Isulan municipality derived its name from "Isu-silan" which means "Progress".

Jose M. Ancheta of the Bureau of Public Highways of Cotabato made its first endorsement to the provincial board and laid down the proposed boundaries of the new municipality.

The LASEDECO had surveyed and parceled out home and farm lots and constructed municipal and barrio roads and installed electrical light generators.

It had brought-in hundreds of farm tractors which uprooted big trees, cleared obstruction, planned, cleaned and harrowed the wide stretches of the area.

When a group of 72 World War II Veterans, led by Venancio Magbanua, Post Commander of Norala had come and settled in the area, on September 7, 1950, a Kalawag root crop used as food coloring was found out abundantly growing.

The most numerous batch was the "PACSA" group headed by Pedro Gabriel and Bienvenido Pamintuan otherwise known as the "Presidential Assistance Commission on Social Amelioration of the President Ramon Magsaysay.

On August 28, 2018, at 8:34 pm, three people were killed and 36 injured during the Hamungaya Festival when an improvised explosive device went off in front of a store in Barangay Kalawag 3 along the National Highway.

[8] On April 3, 2019, 18 people, including children, were injured when an improvised explosive device exploded at a restaurant, possibly motivated by extortion.

[9] On April 17, 2023, seven people were injured when an improvised explosive device exploded inside a bus, which was on a brief stop at Isulan Integrated Public Terminal to drop and pick up passengers.

The municipality has an integrated terminal with buses, vans and jeepneys going to various areas of Soccsksargen, Bangsamoro, and Davao Region.

Bus companies include: Every month of August 30, the municipality of Isulan conducts the Hamungaya Festival to celebrate its foundation.

The flow of body movements, the sound of the music and the grace with which the dance is executed all build up the story or emotions being communicated.

No doubt, this is a unique form of art, and along with other activities or talent being displayed during festivities, it is a contribution to the dreams of establishing solidarity among the peoples in the province of Sultan Kudarat.