Kaum hatte der Wolf das° gesagt, so tat er einen Satz° aus dem Bette und verschlang das arme Rotkäppchen°.

As soon as the wolf had said that, he leaped out of the bed and devoured poor Red Riding Hood.

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The accusative case indicates the direct object in a sentence. You can easily identify the direct object because it answers the question, What?

°das - The wolf said What? -das . Kaum hatte der Wolf das gesagt,...

°einen Satz - He did What? - einen Satz. ..,so tat er einen Satz...

...das arme Rotkäppchen° is in the accusative case because it is the direct object of verschlang. The wolf devoured What?(or Whom?, in this instance) - das arme Rotkäppchen.

The diminutive ending -chen on Rotkäppchen makes the noun neuter.