דברי הימים א, פרק ה׳, פסוק י״ח

The tribes residing on the eastern side of the Jordan River recognized the need for a unified military front. To face their enemies, they combined their individual forces to form a single, large, and highly skilled army.

This unification required a highly organized military census of all men capable of fighting. Much like the careful counting of the Israelites in the desert, these soldiers were registered according to their specific flags and ancestral families [מלבי״ם]. This detailed enrollment likely took place during the reigns of King Jotham and King Jeroboam [מלבי״ם, ביאור שטיינזלץ]. The primary goal of gathering these tribes and organizing their ranks was to launch a war against the Hagrites [רש״י].

The men chosen for this joint army were exceptionally brave and heroic [מצודת דוד]. They brought a variety of specialized combat skills to the battlefield. Among them were expert archers who used a specific technique to maximize their power: they would step on their bows with their feet to pull the string back as tightly as possible, enabling them to shoot arrows over great distances [מצודת ציון]. Beyond their physical strength, these men were highly trained veterans, thoroughly accustomed to the demands of combat [מצודת ציון, ביאור שטיינזלץ].

When the counting was complete, the combined forces totaled forty-four thousand, seven hundred and sixty men. Every single one of these individuals was fully fit, capable, and prepared to march out to the battlefronts [מצודת דוד].