How did submarines change how ww1 was fought?

Submarines revolutionized naval warfare in World War I by introducing a new dimension of stealth and surprise, allowing for targeted attacks on enemy ships without warning. The German U-boat campaign aimed to disrupt Allied supply lines, leading to significant losses in merchant shipping and forcing nations to adapt their naval strategies. This shift contributed to the implementation of convoy systems and increased the use of anti-submarine warfare tactics. As a result, submarines not only altered maritime engagements but also affected the overall strategy and logistics of the war.