* @param tile The <code>Tile</code> where the mounds are.
     * @return An <code>Element</code> encapsulating this action.
     */
    public Element declineMounds(ServerPlayer serverPlayer, Tile tile) {
        tile.removeLostCityRumour();

        // Others might see rumour disappear
        ChangeSet cs = new ChangeSet();
        cs.add(See.perhaps(), tile);
        sendToOthers(serverPlayer, cs);
        return cs.build(serverPlayer);
    }