PorkaMorka said:
1000 spearmen dug in close/urban terrain could easily destroy some WW2 style tanks, using molotov cocktails and various mechanical means to immobilize them.
That's not "1000 spearmen". That's "1000 guys who know what a tank is and just happen to be carrying spears for non-spearman-related purposes". At this point, the unit is more closely modelled by Irregulars, Militia, or Guerrillas. SPEARMEN are an ancient unit that believe a tank is some kind of horrible dragon and are trained to fight in spear formations that make them ideal for mass-flattening by said dragon. They certainly know nothing about improvising molotov cocktails.
On the flipside, I find the idea that a tank can be given the "City Raider" promotion in Civ 4 to be laughable, since tanks are nearly useless in urban combat environments.