Opsrey Military Books mix text as well as pictures and illustrations to convey information covering a specific subject.  They are good initial reference aids, but all serious researchers will want to delve further and look into the sources quoted in each book.

The Vikings (Elite Series)
by Ian Heath

The Irish Wars 1485-1603 (Men-At-Arms, No 256)
by Ian Heath, David Sque (Illustrator)

Romano-Byzantine Armies 4th - 9th Century (Men-At-Arms, No.247)
by David Nicolle, A. McBride (Illustrator)

Byzantine Armies 886-1118 (Men-At-Arms, No 89)
by Ian Heath

Byzantine Armies 1118-1461 (Osprey Men-At-Arms Series, No 287)
by Ian Heath, Angus McBride (Illustrator), Ian Health

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