On May 29, 1453, after an Ottoman army stormed Constantinople, Mehmed triumphantly entered the Hagia Sophia, which would become the city's leading mosque. Emperor Constantine XI died in battle that day, and the decline and fall of the Byzantine Empire was complete.
I know that they went North from South..
If your asking what type of battle it was it was a almost entirely air battle between Britian and Germany
Was it by any chance K-9?