ATB Blitzkrieg In The West has this on page 225.
Regards the Sedan battle May 14th.
Quote:
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Most bombers available to the Advanced Air Striking Force were commited in the afternoon, about 70 bombing bridges and troops in the Meuse valley in three attacks over a total of 45 minutes...No.71 Wing sent 15 Battles and 8 Blenhiems, in the second attack losing 10 Battles and 5 Blenheims...
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139 Sqn being in 71 Wing according to earlier link I posted.
Also photo of one of their Blenheims on page 67.
Have a look at IWM Photo Archive, I searched for "139 Squadron" and found some good photos of them in 1939/40.