Cry Havoc cover
Cry Havoc
ISBN: 1743142307
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crdb · 2015-10-08 · Original thread
To help you answer that literally: according to Simon Mann who did it successfully twice and failed once [1], a successful mercenary invasion and peace-keeping effort in a country like Sierra Leone cost around 1 million GBP in the mid-1990s.

[1] http://www.amazon.com/Cry-Havoc-Simon-Mann/dp/1743142307