If I remember from one of my studies, it must have been the Ottoman Turk armies. After this, Ottomans became an Empire - one of the most powerful empires - and the Eastern Roman Empire fell and lasted. Does this help?
<span>The capital of the Eastern Roman Empire, Constantinople was conquered by the Ottoman Army, under the command Ottoman Sultan Mehmed II on 29th May 1453. Hope this helps!!!</span>
The colonialists were tired of being ruled by Great Britain so they formed an army to fight for their independence. The colonial army kept itself in the war during the difficult early years by trading with the enemy and refusing to pay for British military operations.