How is a settlement inside a meander bend easier to defend and why is a bridging point setlmnt likely to grow?

Question

How is a settlement inside a meander bend easier to defend and why is a bridging point setlmnt likely to grow?

Answer 1

It is easier to defend because more of the village borders the water, an obstacle to invaders.

Bridging points draw many travelers, merchants, etc. who are likely to contribute to the economy by spending their money at the tavern, selling their wares, and so on.

Answer 2

A meandering bend is shaped like a horseshoe.  It provides a "moat" or a wall of water on up to three sides of the settlement.  The enemy attacking from the river can easily be spotted and defended against.  

A bridging point increases the ease of transportation with a land route and a water route.  The settlement benefits from increased trade.  Increased trade means an increased population.