As one of Greece's two major military powers at the time, and with the protection of their Guardian God Zeus, Mycenae had been expanding its territory and conquering numerous lands and city-states over the past two hundred years.
So, although King Agamemnon and the Mycenaeans' calls were loud, the first to enter the fray to test the reality of Troy were basically from other city-states' vassal armies and slaves.
Likewise, in the absence of the older generation of Divine Blood Heroes, Troy too had seen considerable development over the years.
And Hector's title as "Troy's First Warrior" was earned through brutal warfare against foreign enemies, without a hint of exaggeration.
As a knowledgeable and skilled warrior, Hector naturally did not reveal Troy's trump cards at the start of the battle, but instead summoned the Trojans to muster their defense while peering down through the crenels to observe the enemy situation.