Armies are not just soldiers. You need cooks, and blacksmiths, and hunters, and tailors, and all sorts of jobs. Today, those jobs can be all over the world while the soldiers do their thing. Back then, everybody was coming along for the ride.
On top of that, armies would simply steal/pillage as they moved through enemy territory. It wasn’t just “them being bad guys”. Destroying a village weakens the enemy by removing one of their resources, and strengthens your army by getting fresh supplies. It’s strategic.
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