Money for battlefiled

[jokkoo]

how much money do 1000 or more light, heavy,elite soldiers need for attacking other people?

[tiger]

Upkeep of each unit you see in unit description and in place where you hire soldiers.
so when you attack somebody you multiply army upkeep with number of soldiers and traveling time in hours and with 1,5(upkeep is 1,5 higher when attacking in v4a realms)
.
for example 1000 spears on 2 h trip is 1000*0,1*1,5*2 =300 gold