第九章 World Wars 两次世界大战 萨拉热窝事
书迷正在阅读：神级扮演：从小丑开始、地下城之主、全球天选：开局觉醒百倍经验天赋、妖魔入侵：我成救世大剑仙、名侦探柯南续集、火影：等会，我先戴个写轮眼、神奇宝贝之无尽轮回、这个世界的穿越者有点多、异界游戏王之虚空变、潜伏火箭队，只为超梦
the duration of the war. ??German U–boats attempted to cut the supply lines between North America and Britain. The nature of submarine warfare meant that attacks often came without warning， giving the crews of the merchant ships little hope of survival. The United States launched a protest， and Germany modified its rules of engagement. After the notorious sinking of the passenger ship RMS Lusitania in 1915， Germany promised not to target passenger liners， while Britain armed its merchant ships， placing them beyond the protection of the “cruiser rules”which demanded warning and placing crews in“a place of safety”. Finally， in early 1917 Germany adopted a policy of unrest