German U-boats were once the terror of the high seas, and this was true during both world wars. In the First World War, this campaign had much to do with the eventual American entry into the war. But we tend to associate these campaigns with the Second World War, which will probably continue to enjoy more glory than the first one ever did. And, in truth, the Battle of the Atlantic really was quite important. We thus tend to associate the phrase “Battle of the Atlantic” with World War Two, and describe its World War One equivalent simply as the “Atlantic U-boat campaign.” (When using the generic phrase “U-boat campaign,” though, this can also include the lesser-known “Mediterranean U-boat campaign.”) But in a broader sense, the First World War version was also a “Battle of the Atlantic,” and was vitally important in its own right. It was the lifeline of Allied Europe during the Great War, and (as mentioned earlier) played a big role in getting America to enter the war. This post will describe the U-boat front of the Great War, with a particular focus on the changing role of the Americans in this campaign. But I assure readers from other countries that I will tie in our own situation to that of our many allies, since it affected every other nation that participated in these campaigns – as readers may soon see, if they indeed decide to read this post.
German U-boats at Kiel (before the war started), 1914