It should be noted that during the medieval times, merchants typically put the same kind of good together.
From the complete question, it should be noted that merchants would travel to foreign countries and trade his goods. This was done in medieval times.
During this era, merchants typically put the same kind of good together. This was done in order to make it easier to know the amount of goods bought and to easily know the supplies that they've.
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The best option from the list would be "battle" in terms of a category for "bombardment", since this refers to when an enemy launches weapons (usually bombs or missiles) into the territory of the enemy.
Demand for resources by the administrative and military complex