Yylris sends in wolf 1 to try and trip the cockatrice. Yylris will try to flank it and cage it.
Wolf charge attack -> 1d20+7
Rolled 1d20+7 : 11 + 7, total 18
Damage, if hit -> 1d6+3
Rolled 1d6+3 : 3 + 3, total 6
Trip attempt, if hit -> 1d20+3
Rolled 1d20+3 : 4 + 3, total 7
What does Yylris need to do to try and cage the beast? He wants to drop a cage right on top of the thing, standing back to limit exposure to bites from between the bars.