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诞生于危难之秋中国的旅顺港是护卫舰诞生的襁褓。在本世纪初的日俄战争中日军舰艇曾多次偷袭停泊在港内的俄舰,使之遭受巨大损失。为此,俄海军专门组织了一些舰艇来作警戒哨兵。战后,制造专门的护卫舰被各国海军大力关注,新型舰种——护卫舰就应运而生了。第一批专门为巡逻、警戒而建造的护卫舰排水量很小,只有400～600吨左右,抗风浪性差,航速很低,火力弱,只适合在近海活动。第一次世界大战,德国利用潜艇在海洋上展开了潜艇战。仅在1917年的1～4月,德国潜艇就击沉协约国船只达210
Lushun Port, born in a precarious China, is the birthplace of the frigate. In the early days of this century, the Japanese warships repeatedly attacked the Russian ships moored in the port in the Russo-Japanese War that caused huge losses. To this end, the Russian navy specially organized a number of ships to serve as guard sentry. After the war, the manufacture of specialized frigates has been vigorously followed by the Navy of all countries. A new type of frigate-frigate has emerged. The first batch of special frigate built specifically for patrolling and alerting has a very small displacement of only about 400-600 tons and is resistant to storm waves and low speed and weak firepower and is only suitable for offshore activities. During the First World War, Germany used submarines to launch submarine warfare on the sea. In January-April 1917 alone, German submarines sank 210 for the Allies