Learn German: Es kommt eine gewaltige Karawane samt den Tieren. - A massive caravan is coming including the animals.

The preposition samt always forces the noun that follows it into the dative case. Since we are talking about multiple animals, we use the dative plural article den.

Wait, the plural of das Tier is die Tiere. Why is there an extra '-n' at the end of Tieren?

This is a key rule for the dative plural: if a plural noun doesn't already end in -n or -s, it must add an -n in the dative case. Because samt triggers the dative plural here, Tiere becomes Tieren.

How is samt different from just using mit? Could I say mit den Tieren?

You could use mit, but samt carries a stronger sense of inclusion, translating closer to "along with" or "inclusive of". It emphasizes that the caravan and the animals belong together as a complete package. It also sounds a bit more formal and descriptive than mit.

Why does the sentence start with Es kommt instead of just saying Eine gewaltige Karawane kommt?

This is a stylistic choice using a "dummy es". By placing Es in the first position, the actual subject (eine gewaltige Karawane) is delayed. This builds a bit of anticipation or dramatic effect, which is a very common technique in German storytelling when introducing something new to a scene.