"We have three new litters of kits and four new warriors. We thank StarClan for making the prey in ThunderClan run well this season, and we hope we can continue to feed ourselves in leaf-fall and leaf-bare."
At a Gathering, he reports that he has four new warriors and three new litters of kits. He seems to hint that he wants more territory, so that ThunderClan can feed themselves during the hard seasons. Darkstar, SkyClan's leader at the time, takes the hint, and gives up part of his territory, so ThunderClan has more fresh-kill to feed their kits.
When Darkstar's deputy, Raincloud, protests angrily against this, Vinestar watches without saying anything, though he clearly wants Darkstar to prevail and give ThunderClan the territory. He enthusiastically supports Darkstar when he suggests a new rule to the warrior code: the word of a Clan leader is the warrior code.