Why was the torpedo such an effective weapon for the U-boats (submarines)?

Improved G7e

Explanation:

Well, they began with torpedokrise which were used until 1941 until the much mode advanced G7e took its place.

it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation: