Under the Eagle has 256 pages.
Once An Eagle has 1312 pages.
The Eagle's Prey has 480 pages.
The Eagle Has Flown has 352 pages.
The Eagle's Conquest has 256 pages.
A Catskill Eagle has 311 pages.
The Eagle of the Ninth has 255 pages.
"The Eagle Has Landed" by Jack Higgins typically has around 400-500 pages, depending on the edition and formatting.
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Under Heaven has 567 pages.
Under the Net has 286 pages.
Under Compulsion has 220 pages.
Robbery Under Arms has 300 pages.