The Forces

Caesarians

Army Commander: Gains Scribonius Curio (Good.)

Legio (Marsi) 7 Coh. 3000 HI Average, Pilum and sword
Legio (Paeligni) 8 Coh. 3600 111 Average, Pilum and sword
(Avg. 450 men a Coh.)

Auxiliaries.
Ala Gaulia 1 Ala. 500 HC Vets, Javelin and sword
*Mercenaries 1 Coh. 500 LI Average, Composite Bow
*Mercenaries 2 Coh 1000 LI Average, Javelin

Juba's Forces (**Advanced Guard -10,000)

Army Commander: Saburra (Excellent)
Royal Horse 800 LC Vets, Javelin and sword
Levy Horse 2000 LC Average, Javelin
Levy Foot 8000 LI Average Javelin

Reenforcements from Juba
Mercenaries 2000 HC Vets, Javelin and Sword
Levy Horse 2000 LC Average, Javelin
Levy Foot 2000 LI Poor, Javelin

The Scenario

Instead of advancing too far up the Bagradas valley, Curio realizes that he is walking into a trap and attempts to retreat back through the Numidian skirmishers, and leave the valley. Saburra must slow down the Romans enough so Juba's reenforcements can enter the battle and win it..

Special Rules

1 . The Numidian advance guard under Saburra may be split into two parts, in any combination, an set up in either Area A or B.

2. At the beginning of the fourth tam of the battle, dice for Juba's reenforcements. Roll at the start of the turn.

1-5 No effect.
6 Reenforcements

If no effect, next turn subtract 1 from the die roll for each turn that a No Effect was rolled. In other words, the reenforcements will, at the latest, begin to enter on the ninth turn. 

Schedule

The first reenforcement is the Heavy Cavalry.
On the following turn the Levy Horse enters.
On the turn following the Levy Horse entrance the Levy Infantry enters.

Javelins

The Numidian horse must use javelins. If your rules do not include them, imagine that they are armed with short (4" or less) range bows and use the Horse Archer rules.

The Ground

The valley was flat. I suppose some gentle rises could be used to give a "rolling" look to the ground. The river cannot be forded. Units driven into the river are routed and lost. Units that break due to morale are lost.

Victory

Romans

If the Romans get 75% or more of their forces away. Decisive
If the Romans get 55% or more of their forces away. Tactical
If the Romans get 50% or more their forces away. Draw
If the Romans get 40% or more of their forces away Tactical Numidian Victory
Less: Decisive Numidian Victory.

Notes

*This was based on the standard Aux unit that accompanied a Legio during the civil wars. Usually it was a cohors per legio, the bowmen are conjectural but since there was a colony of Cretans in Syrakuse, Sicily, these troops are possible.

** This is the assumed total of the advanced guard. I don't believe that Curio would have advanced on Saburra unless he had was sure he had a chance to beat him. Ten thousand was usually a good number for an advance guard. The Royal horse were Numidian nobility and veteran solders. It usually was where the action was. The Mercenaries were Spanish Heavy Cavalry hired for their skill and bravery.

More Curio in Africa 49 BCE

Background
The Campaign
Battle of Bagradas
Wargaming the Battle