The first three books of the Honor Harrington series by David Weber have some good action scenes in them: On Basilisk Station, The Honor of the Queen, and A Short Victorious War.
What was wrong with Field of Dishonor
and Flag In Exile?
(Flag in Exile's my personal favorite...)
Absolutely nothing wrong with them, but they tend a bit more toward political drama (IMO) then the more action oriented first three books of the series (again, IMO). Your milage may, and seems to, vary.
I do enjoy the entire series, and always await the next book with much anticipation.