The Blenheims would likely have missed, since the planes had no bombsight.I think our modern day perception of CAS and the 1940's version are slightly different.
Given the intelligence and capability of the day, bombing a bridge 5 miles from the advancing enemy was considered the bees knees in CAS terms.
There was, in 1940, no valid, remotely survivable, bombing role for the Blenheim, which had been designed to do things that (as it turned out) had no place on any modern field of battle.
Meanwhile, Stukas were doing a sterling job for their side.
Well Done Us.