Acl::check() the $action parameter and the default vals , what does that mean?

Hello folks :)
I don't understand what does $action param and its default values mean? Because i can directly write $this->Acl->check("warriors/Aragorn", "ControllerNames/myMethodName") then it works, i don't need to supply $action param.

Then if i do something like at the manual $this->Acl->check('warriors/Aragorn', 'Weapons', 'create'); which method in my WeaponsController class categorized as 'create' ? .
Then suppose i have reloadAmmunition() method in my WeaponsController class. So what reloadAmmunition() is? a create or read or update or a delete? Please somebody help me, i need your enlightenment.

Thank You :)

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