I set up for a night parallel submerged torpedo attack on a large convoy south of Truk. Had only one high value target in the middle - a large modern tanker. Had plenty of time to set up and nail a solution and I was waiting for the tanker to drive into the shot, and wouldn't you know the lead tin can somehow gets a whiff of me! Starts pinging!

Now, it's kinda rough out - windy and noisy as all getout on the surface - I'm at all stop and under silent running

. So, I raise the scope and swing it to the destroyer who's coming straight at me - zero AOB - at about 800 yards.
Now, I'm PO'd!

I quickly input the bearing and approximate range into the TDC, the PK already running, and shifted to the attack map. The AOB was all wrong, as was the speed, but I spun that spread dial around and launched a spread of three ahead of the SOB. Got two hits and down he went. If newbies on the forum could post attachments, I'd add a screenshot of the DD being hit

.
Now, of course, the convoy's alerted to my presence. so, I used a tactic I learned on the Whale, dove down to 250 feet so my screws wouldn't cavitate, ran down that tanker at speed and popped up to periscope depth and made another snap shot from 450 yards with 3 and got my intended target anyway. Dove back down to 280 feet at ahead 2/3 and went on my way.
Perseverence pays, gentlemen.