Causeway

Raises how much your army can carry: you come back from the same raid with more loot.

A stone-paved road running over marsh, mud and streambeds. Those who build the causeway drive piles, spread gravel, and fill the potholes again after every rain.

A stone road is a road for heavy loads. Carts coming home from a raid do not sink here, and the plunder reaches the holding whole.