Thank you guys again for the help.So today this story ends with your way, but in the reality that i have created these last days.
The Dragons have take control of the left upper deck of the inner castle and soon they managed to take under control the whole upper deck.
The Grand Master of Templars asks from his men to gather in the main yard and when the dragons will break the gate door to make a exodus from the Castle to the side of king's Alexander's army.
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So, the moment that the Dragons have broken with their ram the great gate door the Templars opened the rear door and make a suprizing attack that left the dragons like statues.