David's military campaign against Hadadezer, the king of the Aramean kingdom of Zobah in central and western Syria, took place far beyond the borders of Israelite settlements [ביאור שטיינזלץ]. However, this clash was rooted in a bitter history of conflict. In the past, Hadadezer had inflicted severe damage on the Israelites, even conquering portions of their land. This earlier defeat was deeply traumatic, later echoed by David in the Book of Psalms as a time when God had rejected and broken the nation's defenses. Recognizing a renewed threat, David launched a campaign to fight back and avenge his people [רד"ק, אברבנאל].
The decisive confrontation occurred while the Aramean king was embarking on his own military expedition, rather than during David's advance [רש"י, ביאור שטיינזלץ]. The primary approach among commentators is that Hadadezer was actively attempting to expand his kingdom, seizing new territories [רש"י, מצודת דוד, ביאור שטיינזלץ] and encroaching upon Israelite land [רד"ק, אברבנאל]. His goal during this march was to establish a firm grip over the region and solidify his expanding boundaries [מצודת ציון, רד"ק, אברבנאל].
Offering a different perspective, a unique approach outlines a physical sequence of events near the Euphrates River. According to this view, Hadadezer had previously erected a hand-shaped monument by the river to symbolize his dominance over the area. David had recently destroyed this structure, and Hadadezer was marching his army toward the Euphrates specifically to rebuild and restore his fallen monument when David intercepted him [מלבי"ם].