That was it, thank you very much, I am now one baby step closer to being a Splunk Guru!!! Below is my whole search now working perfectly!!!
(index=windows EventCode=4624) OR (index=fortinet dstport=3389) | stats sparkline count by srccountry,srcip,dstip | sort srccountry |lookup dnslookup clientip as srcip OUTPUT clienthost as Attacker_Host | lookup dnslookup clientip as dstip OUTPUT clienthost as FH_Computer
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