public static byte[] getAllianceUpdate(MapleGuildAlliance alliance) {
            MaplePacketLittleEndianWriter mplew = new MaplePacketLittleEndianWriter();

            mplew.writeShort(SendPacketOpcode.ALLIANCE_OPERATION.getValue());
            mplew.write(23);
            addAllianceInfo(mplew, alliance);

            return mplew.getPacket();
        }