In the film, the representative of the German submarine force is the German captain who calls himself the Big Bad Wolf on the radio.
This captain should be a forerunner of psychological warfare. He is not only a talker, but also repeatedly attacks the escort formation with provocative and sarcastic words, which is both arrogant and hateful.
Of course, in actual combat, there should be no such captains. The director virtualized such a character, described the relationship between wolves, shepherd dogs and sheep in simple terms, and summarized the psychological activities of many members of the escort ship. In the vast sea, fighting to the death with invisible enemies, and seeing the constant fall of partners, the deepening sense of exhaustion and even despair will devour everyone's hearts.
In the final two-on-one battle, the U-boat commanded by the Big Bad Wolf actually had a chance to deal with the Greyhound through emergency diving and underwater maneuvers after the first attack failed. However, this meant that the U-boats went into passive defense and lost their planes completely (because they were about to enter the Allied air cover), and the Greyhound didn't know that the Greyhound actually had no depth charges.
So, in the face of the Greyhound, which was rushing up aggressively, the Big Bad Wolf gave up the emergency dive, but continued to stay in the shallow water and fired a torpedo at the Greyhound. As a result, the single-shot torpedo aimed at the bow was easily dodged. Perhaps, the Big Bad Wolf wanted to use the Greyhound's maneuvering to fire a double salvo to completely resolve the battle, but unfortunately the director didn't give him this chance.
If the U-boat is injured and loses its ability to snorkel and is forced to float up, in all likelihood, it will be waiting for a twist. Especially in the face of a destroyer charging at high speed, it is simply an asymmetrical fight like a hound versus a chicken. The Greyhound turned and used the artillery and machine guns at the fore and aft to fire a salvo of battleships. The Big Bad Wolf's U-boat was a target, and it was powerless to fight back, and eventually became a fireball after it was penetrated by the ammunition depot, Big Bad Wolf's pawn...
Finally, after the arrival of the Allied seaplanes, they used a string of depth charges to send another U-boat into the sea. This is the epitome of the entire Atlantic battle. Although the German submarine force fought heroically, it was still in ashes in front of the Allied forces occupying the sea and air superiority, and it could not affect the course of the war.
In the film, 7 submarines appeared before and after Germany, and 4 were sunk. The result was the sinking of 7 merchant ships, 1 destroyer, and 2 wounded. At first glance, it seems to be good, but it is actually a big defeat. In the Battle of the Atlantic, the ratio of U-boats to merchant ships was close to 4 to 1. That is to say, if the loss of 4 U-boats should be exchanged for at least a dozen merchant ships plus 1-2 escorts, it would be considered a barely tie. This battle can be described as stealing chickens without losing rice.
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