The traditional and main naval strategy employed by the Japanese was that of "grapple-and-board", whereby sailors would attempt to board an enemy ship and fall to sword fighting on the decks. This method was mainly used because Japanese soldiers excelled at melee combat and because their ships were very fast. The Japanese Navy's concept of sea battle was therefore one of a fight between crews rather than the vessels themselves. This was the most common naval strategy in the world during this time, and was also used by the Spanish and the home fleets of the Mediterranean and Indian Ocean of the day. The Korean Navy, however, utilizing superior warships and firepower, engaged in a more modern, distanced kind of naval warfare. During Hideyoshi's invasions of Korea, a vast number of Japan's transports and warships were destroyed by Admiral Yi Sun-shin's leadership and strategies, superior firepower, and knowledge of strategic points on what amounts to a home field advantage.