Sihon's victory over Moab was significant, but was it just the start of his own undoing?
The verse highlights that Heshbon was the capital city of Sihon, the Amorite king, who had previously waged war against the Moabites and taken their land, including the territory around Ar and the heights of the Arnon.
This historical context is crucial. Sihon's empire, built on conquest, had pushed the Moabites out of their ancestral lands. The 'fire' from Heshbon represents this expansionist ambition. However, this success ultimately set the stage for the Amorites' own downfall. Their victory over Moab and their subsequent actions when Israel requested passage would lead to their destruction by the Israelites, fulfilling God's judgment upon them.