* @return An amount to raise tension by.
     */
    private int getSlaughterTension(Unit loser) {
        // Tension rises faster when units die.
        Settlement settlement = loser.getSettlement();
        if (settlement != null) {
            if (settlement instanceof IndianSettlement) {
                return (((IndianSettlement) settlement).isCapital())
                    ? Tension.TENSION_ADD_CAPITAL_ATTACKED
                    : Tension.TENSION_ADD_SETTLEMENT_ATTACKED;
            } else {
                return Tension.TENSION_ADD_NORMAL;
            }
        } else { // attack in the open
            return (loser.getIndianSettlement() != null)
                ? Tension.TENSION_ADD_UNIT_DESTROYED
                : Tension.TENSION_ADD_MINOR;
        }
    }