Bit of poetic licence here I think - Wellingtons bombing at what looks like 100ft?
Yer them Wellingtons wurz Blenheims abert 6 of 'em not only 4.
Those 6 made up most of the force in the area at the time though they were sometimes backed by another front line bomber the Lysander.
Learnt a bit from reading extracts from A Flying Tiger's Diary
By Charles R. Bond on Google books.