Somewhere in past seasons somebody said that it would be suicide to meet a Dorthaki horde in open combat. It might have been Robert in season 1. If you've got a massive army of the most feared open field combatants in the world I would say that is very useful. If nobody wants to fight you they sit in their castles, how long will a siege last with a dragon melting the stone? Can't beat them on the field, can't wait them out in our castles. We surrender. A dragon wouldn't be as effecient in open field combat as his dragon fire is limited to swaths whereas the armies will be constantly moving and wheeling into different formations. Still a great tool and a huge leg up, but some of these armies are over 100k strong, I don't think even with Danny's combined forces she has that many troops. If I remember right the Lannisters had 60k men before the battle of the Blackwater and then they were joined by the Tyrells after the fact. And with enough arrows even the toughest dragon will go down to 100k.
The dragons are a massive tool and very useful for Danny, but she can't conquer seven kingdoms with just three dragons.
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"In brightest day, in blackest night / No evil shall escape my sight / Let those who worship evil's might / Beware my power, Green Lantern's light!"
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