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In the spring of 871, the Y----ist and Ba'alist forces finally met at Dan. The battle is fairly complicated, so I created a series of maps for the battle:

Initial positions:

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The Yehuites were unaware of the presence of the Surians, and the Yis'realites of the zealots behind the ridge.
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The Surians round the ridge in an attempt to flank the Y----ist forces, only to run smack into the zealots. The Numidians, even as the superior horsemen as they are, are armed only with ranged weapons and quickly become bogged down as the fanatics swarm around the cavalry.
'Ah'ab and his heavy infantry advance over the Jordan and spread out to engulf the Yehuite infantry
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The Numidians route and the zealots wheel north, pressing in on the Yis'raelite flank.
Yehu and his heavy infantry take a page from Ataman Eretgrulogu (Shameless plug for A New Alexiad) and launch a full-out charge at the enemy lines while they are still forming up. The initial charge pushes far into the Yis'raelite lines.
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As the zealots charge into the Yis'raelite flank the conscripts in reserve panic and route, leaving the heavy infantry unsupported as the Yehuite heavy infantry continue to surge forward. The left flank collapses and routes.
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As the leading edge of the charge slows, 'Ah'ab and his bodyguard are thrust into melee, his banner briefly falling. With the left flank gone and the right flank encircled, the standard falling sparks the center to collapse and the Yis'raelites to route. 'Ah'ab manages to survive unscathed

Outcome:

Close Yehuite Victory
2,500 Yis'raelite dead or wounded, 1,500 deserted : 1,000 Yehuite dead

The Battle of Dan (881 BC) is a textbook definition of a long-odds victory. It remains one of the most well-known battles in ancient history to this day thanks to the extensive records from all three factions.