Final answer:
Vlad III Dracula was defeated and killed in battle with Basarab III Laiota due to a combination of factors, including desertion of his forces and superior tactics employed by Basarab III.
Step-by-step explanation:
In the battle between Vlad III Dracula and Basarab III Laiota, Vlad was defeated and killed due to a combination of factors. One important factor was Vlad's own forces deserting him, which weakened his army and made it easier for Basarab III to defeat him. Additionally, Basarab III may have employed superior tactics that outmaneuvered Vlad's army, contributing to his defeat.