在长期战争年代中,我军基本上是在武器装备极为低劣的情况下进行作战的,火力打击能力非常弱。在此种情况下,敌军构筑的各种碉堡就成了我军夺取胜利的极大障碍。舍身炸碉堡的董存瑞、梁士英,以身体堵枪眼的黄继光、许家朋、李家发都是在攻击敌碉堡时牺牲的。这些形似“乌龟壳”的碉堡给我军造成很大伤亡,也正是在一次次攻打碉堡战中,我军积累了宝贵的战术经验—— In the long-term war years, our military basically carried out operations with extremely poor armaments, and its firepower capability was very weak. Under such circumstances, the various bunkers built by the enemy army have become a great obstacle to the victory of our army. Dong Cunrui and Liang Shiying who sacrificed themselves to the bunkers, Huang Jiguang, Xu Jiapeng and Li Kaifai, both of whom physically block their eyes, sacrificed their enemy bunkers. These bunkers, which resemble the “turtle shell”, caused great casualties to our army. It was also during the time when we attacked the bunker that our army accumulated valuable tactical experience -