Iron Coffins is a superb memoir of the Battle of the Atlantic in World War II through the eyes of Herbert Werner, a German U-boat captain. It is a gripping but ultimately tragic story of early successes, apocalyptic defeat, and miraculous survival.
From 1940-1942, the German U-boat war against Allied convoys sent millions of tons of shipping to the bottom of the Atlantic. Britain was utterly dependent on imported goods for survival, such as food, fuel, and raw materials for its factories. If Germany cut Britain off with a successful blockade, Britain would be forced to surrender.
The tactics and technology of the early war gave the U-boat advantages over surface destroyers and merchant ships. The Germans called these years "the Happy Time." Winston Churchill himself said that the U-boat threat was the only German weapon that truly frightened him.
Unlike the nuclear submarines of today, the U-boat was essentially a slow and vulnerable surface vessel that could submerge for very short periods (1-3 days at most, or until its batteries ran out). The vast majority of its time was spent on the surface, either traveling to and from a port or hunting for merchant convoys. When an airplane or destroyer appeared, it would dive and wait until it went away. The U-boat would hunt during the day, then wait until nightfall to fire its torpedoes at unsuspecting merchant vessels.
This worked well in the early years of the war. But technology and tactics progressed very quickly on the Allied side. Soon, British, Canadian, and (beginning in January 1942) American destroyers deployed ever more advanced versions of sonar and radar. More and more aircraft with longer and longer ranges flew U-boat patrols from the UK and North America. These airplanes, assisted by aircraft carrier escorts, finally closed the "air gap" in the mid-Atlantic. The British made extensive use of naval mines and fielded ever more powerful depth charges. American shipyards built faster and more deadly destroyers and launched more than one merchant ship a day, faster than the Germans could sink them. British scientists also broke the German Enigma codes, allowing convoys to avoid U-boat patrols and Allied aircraft to hunt them down. On the German side, little progress was made to the Type VII U-boat, which remained the workhorse of the fleet throughout the war.
This convergence of technologies, production, and tactics led to "Black May" in 1943, when 25% of the U-boat fleet was sunk. The tide of the Battle of the Atlantic swung permanently and decisively against Germany. From then until 1945, the U-boat fleet was almost entirely annihilated, suffering more than 80% losses.
Werner's account is so unique because he was one of the very few U-boat officers to fight the entire war and survive. As an ensign, then an Executive Officer, then a Captain, Werner was both incredibly skilled and incredibly lucky, escaping death multiple times. He was based in Brittany, France, where the Germans built enormous concrete submarine pens which can still be seen.
Iron Coffins is very well written. You really feel like you are right next to Werner as he attacks a convoy or endures 48 hours of depth charges in the North Atlantic. The hardships that these men had to endure were incredible: 8-10 weeks at sea, no privacy, no daylight, filthy conditions, and the psychological pressure of knowing that you are likely going to end up dead at the bottom of the Atlantic in a war that you knew was going badly.
Between patrols, Werner explored France and returned to visit his family in Germany. He describes the ominous deterioration of the war and the increasing Allied bombing campaigns in Germany. From 1944 on, he suffers several family tragedies as Germany is bombed into ruins. Nearly all his classmates who graduated from officer school were killed at sea. You really sympathize with him as he risks his life for a war that he knows he is going to lose.
Although Werner was quite a womanizer, there is thankfully nothing graphic or pornographic in his memoir (unlike most war books today).
When the war ends, he finds himself at a U-boat base in Norway where he is captured by the British and sent to a POW camp in France. He makes several escapes and miraculously makes it back to Germany, which itself is an adventure.
Iron Coffins is a superb war memoir that will give you a greater appreciation for submarine warfare and the brave men of both sides who fought beneath the waves in World War II.