Forum:Will Gladiator Beasts return to the deck if they are destroyed by battle and sent to the graveyard?

I have a gladiator beast deck. I constantly am asked if the Gladiator Beasts return to the deck if they are destroyed by battle and sent to the graveyard. The rulings on the card isn't very clear as to say if the effect activates even in the graveyard. So do they return to the deck or will i have to start the chain all over again and re summon other gladiator beasts?