Answer:
Soldiers.
Step-by-step explanation:
Soldiers laid down their lives in defense of the tribal people because they also citizens of the state and the army is responsible for saving their lives at any cost. Soldiers are the people who laid their lives in protection of its people as well as for defending the boundaries of its country. These soldiers are gems of our nations that work without any benefits or advantage, they only do of their love for the country and its people so we can say that soldiers laid down their lives in defense of the tribal people.