The founding of the Kenkiba corps goes back twelve years.
He was in his early twenties by the time he was a Captain.
Gilboa had a powerful cursed sword and technique, he was a feared mercenary with no enemies near his level.
Both Adventurers and mercenaries gathered round him, during times of war they were a mercenary group, but to be successful in times of peace they repeatedly did quests with high levels of difficulty, during that time they racked up achievements and became the top clan. (TN: Toppu Kuran. No joke that is in the raws)
The Kenkiba corps fights in a rather orthodox way. It is a very different fighting style to adventurers.
They have they an infantry team with magically blessed swords, shields and armour as the vanguard. They have the rear guard equipped with powerful crossbows for long distance, making their enemies look like hedgehogs.
The vanguard holds off the enemy when they approach. The middle defence breaks or hooks their shields and pulls them over with morning stars and battle axes. (TN: Raws is ボールアーム which translates to ball arm, but made more sense as morning star.)
The rear guard again loads their crossbows with the vanguard moving left and right to move out of the way.
Thirty people fight like a living creature. The Captain always stands on the frontlines to inspire his comrades.
They are trained and equipped so that they can fight even if they are split into teams of 5, 10 or 20.
I was amazed by how extravagant their fighting style is.
Just in case you needed a reminder.