The documentation for the I_NumberUnitsInSettlement condition is:

Code:
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Identifier:              I_NumberUnitsInSettlement
Trigger requirements:    
Parameters:              settlement, unit type (UNIT_DESCRIPTION.id), logic token, quantity
Sample use:              I_NumberUnitsInSettlement Tarquinii roman_city_militia < 5
Description:             How many units are in the settlement?
Battle or Strat:         Strat
Class:                   NUMBER_UNITS_IN_SETTLEMENT
Implemented:             Yes
Author:                  Guy
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The second parameter is a unit type identifier. Does anyone know if there is an identifier (like "any" or "all") valid for any unit? I want to test against the total number of units in a settlement; I don't care how many of any particular type there are.