Shallow waters convoy ambush

[prologos]

Hello all! I just encountered my first convoy in the career I am playing. I found it just off the port of Hartpool, a large convoy with at least 4 ascorts (maybe more) and perhaps a dozen merchants. Since I have read many threads about convoy attacks I knew that it could be suicide to attack them in shallow waters (about 40 - 60m), but since it was my first I thought I should save and give it a go. I went to silent running, plot a nice perpendicular course (i play at 100% realism GWX) and as soon as I got at about 2km from 2 large merchants roughly in the front of the convoy I fired two torpedoes at each, made an 180 turn and opened my ears to hear the explosions. Surprisingly every torpedo I fired hitted home. Allthough I remained at periscope depth none of the escorts seemed to coming into my direction (I think they didn't even started to looking for me except for the search lights). I brought my periscope slowly above the water and saw a large cargo directly behind me so I fired my stern tube at it and i scored another hit. The funny thing is that none of the ships left in the convoy after my first attack started evasive manouvers.

Is that normal? Does the actual state of the war plays a role in the escorts efficiency? (I am in January '40).
In GWX are there only the historical convoys mentioned in the manual or the game creates also random convoys (as I imagine is the one I encountered)?

Anyway this game (especially with GWX) is completely awesome. I am a sub simulation veteran you could say (the first i played was silent service II) but I am completely stunned by this game and GWX. And when I saw the most famous ship of my country (Pisa Class "Georgios Averof") was included in GWX I was even more stunned than before.

Greetings everybody from Greece

p.s. sorry about my spelling and grammar