What kind of warfare did the German empire use to sink allied war/merchant trade ships?

Unrestricted submarine warfare

Explanation:

Unrestricted submarine warfare was first introduced in World War I in early 1915, when Germany declared the area around the British Isles a war zone, in which all merchant ships, including those from neutral countries, would be attacked by the German navy.

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the ottoman empire

the christian crusades: conquered constantinople in 1453 ce

alexius sultan of the ottoman empire

fall of avars   by ottomans ended byzantine empire

the ottomans made islammic   the primary religion in the region, replacing orthodox christianity. they did allow the practice of christianity