Escorts or Merchants?

[Von Mack]

Having only completed 2 patrols so far (both in 1940), I am finding it relatively easy to knock one of the escorts in a convoy before getting to work on the Merchantmen. However, I may have been lucky so far and wondered what the general opinion is of this practise (I find that these early convoys normally have only 3 or 4 escorts and are quite easy prey.........)