How to engage / report this convoy?

[Kubryk]

Hi guys,

it took me almost 9 months at sea, with brief breaks, and on my 5th patrol since 1 Sept. 1939 I spotted my first convoy. Sea-gods listened to my prayers and for the first time in my game experience I can enjoy clear waters with no wind. I did a couple of check-ups without attacking, now I know that convoy looks like this:

Corvette Flower (end of convoy)

C2/3----C2/3----C2/3----C3----
SM-----C2/3-----T3-----SM----C2/3
SM-----C2/3-----ST----C2/3---SM
SM-----C2/3-----T2-----SM----SM

Destroyer (head of the convoy)

I'm greedy - I'd link to sink 'em all. Unfortunately most of the C2/C3s have USA flag, but big tankers are British.

In my VIIB I have:
1 steam on stern, no reserve
1 steam, 3 electric on bow, 3 electric in reserve (onboard)

Total: 8 torpedoes, ca. 160 shells for my deck gun.

Now - how to make the most of it? In order to use deck gun I must sink DD (I can do this) but how to hit that corvette? Is it wise to engage her with deck gun from distant place? I don't think I'll be able to sink her wasting only one torpedo.

I'd like to sink T2, T3 and couple of big merchants with torpedoes and finish as much small merchants as possible with deck gun.

What tactic would you reccomend? We're quite close to coast of Ireland.

Also - I should report a convoy. How can I do this?
Let's say I'm chasing them, I spot a corvette. I ID this ship in my notepad, than click 'send contact report'. Does BdU in SH3 know that I'm reporting a convoy or do I have to report every single ship manually?

Thanks for help, I'd really like to destroy my first convoy totally