Duststar leads the battle against RiverClan, because WindClan is thought to be stealing fish. A WindClan warrior, Ryewhisker, is killed during this battle. Duststar creates the rule that A cat must remain loyal to their clan, they may have friendships with other clans but their loyalty must remain to their clan.
Also, when Birchstar suggests a truce, which turns into the modern day Gathering, he strongly inputs the idea. He is seen being very wise. He, along with the other leaders, establish a strong feeling for the Warrior code for many seasons to come.