– it’s comparably difficult to swing a sword upwards compared to downwards
– projectiles (arrows, in this case) have a longer flight if the ground conveniently slopes underneath them
– it’s a lot easier to throw things downwards than upwards
– things tend to roll downwards by their own account, but seldom roll upwards by themselves
– it’s easy to pour liquid downwards, impossible to pour it upwards
You pretty much give your opponent a disadvantage, by hiding from them in plain sight. Hence the proverb *fighting an uphill battle* that literally means that your opponent is better prepared than you are and more likely to win.
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