When any enemy encountered, I will always engage! Never to retreat, unless it was a last resort, or too many casualties to the crew and U-15 itself. I have encountered 4 S Class submarines, and didn't hesitate to make a shot, I have went under water, I'll follow them until I get close enough, surface from behind and fire abroad..usually from the right side.
Sometimes firing at the propellers, it can destroy it and make the boat completely immobile, that's what I do when it becomes at escape-risk or if it's too much of a strong ship. Make it completely immobile, shoot or be patient until it sinks.
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