The answer is: Judah

Judges 1:2

In the unfolding narrative of the Book of Judges, the tribe of Judah steps into the spotlight as the first to respond to the Canaanite challenge. Picture this: after the Israelites' long Egypt adventure, facing daunting foes in Canaan was their next monumental task. What’s fascinating is that Judah, which means "praised," literally symbolizes fighting spirit and bravery; could they be more equipped than just physically?

Judges 1:2 says, "The Lord said, 'Judah shall go up; behold, I have delivered the land into his hand.'" That's not merely a battle cry but an assurance of divine backing. It sets an inspiring precedent, showing how pivotal encouragement from a higher language—let's interpret it as reason or vision—can bolster human resolve.

Now, let's delve deeper. Despite Judah's triumphs, their narrative paves the way for complex alliances and entwined histories, demonstrating that unity doesn’t always translate into strength. Did you know that Jerusalem—later established as a key city—was captured by David from the Jebusites, the Canaanite occupants? That merge came from mixing Judah’s initial bravado and some clever strategizing, as David understood the importance of this city for his reign.

Moreover, interestingly, a common purpose seemed important. Each tribe at odds initially joined forces later on with the same target, hinting that sometimes collaboration is born from necessity. Judah’s actions remind us that sometimes, you raise your sword to diminish challenges while calling others to join the noble quest of community building.