Final answer:
The elite forces of enslaved Christian boys who served in the Sultan's army were called Janissaries.
Step-by-step explanation:
The name of the elite forces of enslaved Christian boys who received military training and then served in the Sultan's army was Janissaries. The Janissaries were a highly trained and disciplined infantry force of the Ottoman Empire, known for their loyalty and effectiveness in battle. They played a significant role in the expansion and defense of the empire.
Learn more about Janissaries