On the eve of World War I, the art of submarine warfare was barely a dozen years old; no nation had submarine-qualified officers serving at the senior staff level and no nation had developed any method for detecting submarines, or attacking them if...
![Словарь американской истории [с колониальных времён до первой мировой войны]](https://www.rulit.me/data/programs/images/slovar-amerikanskoj-istorii-s-kolonialnyh-vremyon-do-pervoj_435922.jpg)
