My one and only complaint about "Eagles" is the chase sequence from the castle to the the Ju-52.
It seems to be one 'yeah, right' moment after another as our heroes drive a magic snow bus that can withstand hails of gunfire, stay just ahead of pursuing military vehicles, smash through an oddly unguarded airfield gate, wreck T-6 aircraft in turn, and find the Ju-52 at the right portion of a sprawling airfield complex; while Richard Burton and friends shoot with astounding marksmanship at the right instant (including killing the one officer on the one alert phone in the airfield control tower, and from ground level with a submachine gun, no less) and the Germans are strangely slow on the uptake. After all, what chance does a Ju-52 have in daylight flying into and out of the heart of Bavaria in 1943? Whew....
Aside from that rant, I still consider "Eagles" to be one of the best fictional WWII thrillers for the 1960s. For something in that sub-genre more plausibly better, I recommend "The Eagle Has Landed" from the 1970s.
--Karl