The eastern district was famous for three main things.
First of all, its large presence of soldiers and their families, giving it the colloquial name- Soldier's district.
Second was its large, permanent slave market situated near the gates. It was said a thousand slaves were sold every day there, which was roughly 0.5% of the city's total population.
Third was its various legal and illegal pleasure centers.
And it was this last section that Alexander decided to focus on first.