Egypt:
1 general (preferably the faction leader)
19 Hashashim

Deployed as:

Frontline
H-H-H-H-H-H-H-H
Middle line:
H-H-H-H-G-H-H-H-H
Backline:
H-H-H-H

Strategy:
Use the Hashashim frontline to batter the enemies front ranks. Concentrate on the middle of their line while the Middle line assault then outer sides. Only use the backline as reserves. Bring a unit in if another is taking heavy casualties. Use 3 or 4 centre units to overwhelm the enemies centre unit. Then use these to head straight for the general. Speed is the key here in this plan but mostly let the Hashashim get into a fighting rhythm then strike with the back line when you’ve killed or routed their general to rout the whole army.